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How to Write a Literature Review | Guide, Examples, & Templates

Published on January 2, 2023 by Shona McCombes . Revised on September 11, 2023.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research that you can later apply to your paper, thesis, or dissertation topic .

There are five key steps to writing a literature review:

  • Search for relevant literature
  • Evaluate sources
  • Identify themes, debates, and gaps
  • Outline the structure
  • Write your literature review

A good literature review doesn’t just summarize sources—it analyzes, synthesizes , and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

What is the purpose of a literature review, examples of literature reviews, step 1 – search for relevant literature, step 2 – evaluate and select sources, step 3 – identify themes, debates, and gaps, step 4 – outline your literature review’s structure, step 5 – write your literature review, free lecture slides, other interesting articles, frequently asked questions, introduction.

  • Quick Run-through
  • Step 1 & 2

When you write a thesis , dissertation , or research paper , you will likely have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

  • Demonstrate your familiarity with the topic and its scholarly context
  • Develop a theoretical framework and methodology for your research
  • Position your work in relation to other researchers and theorists
  • Show how your research addresses a gap or contributes to a debate
  • Evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.

Writing literature reviews is a particularly important skill if you want to apply for graduate school or pursue a career in research. We’ve written a step-by-step guide that you can follow below.

Literature review guide

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

  • Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
  • Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
  • Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
  • Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research problem and questions .

Make a list of keywords

Start by creating a list of keywords related to your research question. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list as you discover new keywords in the process of your literature search.

  • Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
  • Body image, self-perception, self-esteem, mental health
  • Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some useful databases to search for journals and articles include:

  • Your university’s library catalogue
  • Google Scholar
  • Project Muse (humanities and social sciences)
  • Medline (life sciences and biomedicine)
  • EconLit (economics)
  • Inspec (physics, engineering and computer science)

You can also use boolean operators to help narrow down your search.

Make sure to read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

You likely won’t be able to read absolutely everything that has been written on your topic, so it will be necessary to evaluate which sources are most relevant to your research question.

For each publication, ask yourself:

  • What question or problem is the author addressing?
  • What are the key concepts and how are they defined?
  • What are the key theories, models, and methods?
  • Does the research use established frameworks or take an innovative approach?
  • What are the results and conclusions of the study?
  • How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
  • What are the strengths and weaknesses of the research?

Make sure the sources you use are credible , and make sure you read any landmark studies and major theories in your field of research.

You can use our template to summarize and evaluate sources you’re thinking about using. Click on either button below to download.

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It is important to keep track of your sources with citations to avoid plagiarism . It can be helpful to make an annotated bibliography , where you compile full citation information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

To begin organizing your literature review’s argument and structure, be sure you understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

  • Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
  • Themes: what questions or concepts recur across the literature?
  • Debates, conflicts and contradictions: where do sources disagree?
  • Pivotal publications: are there any influential theories or studies that changed the direction of the field?
  • Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

  • Most research has focused on young women.
  • There is an increasing interest in the visual aspects of social media.
  • But there is still a lack of robust research on highly visual platforms like Instagram and Snapchat—this is a gap that you could address in your own research.

There are various approaches to organizing the body of a literature review. Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarizing sources in order.

Try to analyze patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organize your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

  • Look at what results have emerged in qualitative versus quantitative research
  • Discuss how the topic has been approached by empirical versus theoretical scholarship
  • Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text , your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, you can follow these tips:

  • Summarize and synthesize: give an overview of the main points of each source and combine them into a coherent whole
  • Analyze and interpret: don’t just paraphrase other researchers — add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
  • Critically evaluate: mention the strengths and weaknesses of your sources
  • Write in well-structured paragraphs: use transition words and topic sentences to draw connections, comparisons and contrasts

In the conclusion, you should summarize the key findings you have taken from the literature and emphasize their significance.

When you’ve finished writing and revising your literature review, don’t forget to proofread thoroughly before submitting. Not a language expert? Check out Scribbr’s professional proofreading services !

This article has been adapted into lecture slides that you can use to teach your students about writing a literature review.

Scribbr slides are free to use, customize, and distribute for educational purposes.

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If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.

  • Sampling methods
  • Simple random sampling
  • Stratified sampling
  • Cluster sampling
  • Likert scales
  • Reproducibility

 Statistics

  • Null hypothesis
  • Statistical power
  • Probability distribution
  • Effect size
  • Poisson distribution

Research bias

  • Optimism bias
  • Cognitive bias
  • Implicit bias
  • Hawthorne effect
  • Anchoring bias
  • Explicit bias

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.

There are several reasons to conduct a literature review at the beginning of a research project:

  • To familiarize yourself with the current state of knowledge on your topic
  • To ensure that you’re not just repeating what others have already done
  • To identify gaps in knowledge and unresolved problems that your research can address
  • To develop your theoretical framework and methodology
  • To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your thesis or dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

A literature review is a survey of credible sources on a topic, often used in dissertations , theses, and research papers . Literature reviews give an overview of knowledge on a subject, helping you identify relevant theories and methods, as well as gaps in existing research. Literature reviews are set up similarly to other  academic texts , with an introduction , a main body, and a conclusion .

An  annotated bibliography is a list of  source references that has a short description (called an annotation ) for each of the sources. It is often assigned as part of the research process for a  paper .  

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Writing a Literature Review

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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.

Where, when, and why would I write a lit review?

There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.

A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.

Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.

What are the parts of a lit review?

Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.

Introduction:

  • An introductory paragraph that explains what your working topic and thesis is
  • A forecast of key topics or texts that will appear in the review
  • Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
  • Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
  • Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
  • Critically Evaluate: Mention the strengths and weaknesses of your sources
  • Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.

Conclusion:

  • Summarize the key findings you have taken from the literature and emphasize their significance
  • Connect it back to your primary research question

How should I organize my lit review?

Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:

  • Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
  • Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
  • Qualitative versus quantitative research
  • Empirical versus theoretical scholarship
  • Divide the research by sociological, historical, or cultural sources
  • Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.

What are some strategies or tips I can use while writing my lit review?

Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .

As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.

Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:

  • It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
  • Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
  • Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
  • Read more about synthesis here.

The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.

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What is a literature review?

A literature review is an integrated analysis -- not just a summary-- of scholarly writings and other relevant evidence related directly to your research question.  That is, it represents a synthesis of the evidence that provides background information on your topic and shows a association between the evidence and your research question.

A literature review may be a stand alone work or the introduction to a larger research paper, depending on the assignment.  Rely heavily on the guidelines your instructor has given you.

Why is it important?

A literature review is important because it:

  • Explains the background of research on a topic.
  • Demonstrates why a topic is significant to a subject area.
  • Discovers relationships between research studies/ideas.
  • Identifies major themes, concepts, and researchers on a topic.
  • Identifies critical gaps and points of disagreement.
  • Discusses further research questions that logically come out of the previous studies.

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1. Choose a topic. Define your research question.

Your literature review should be guided by your central research question.  The literature represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

  • Make sure your research question is not too broad or too narrow.  Is it manageable?
  • Begin writing down terms that are related to your question. These will be useful for searches later.
  • If you have the opportunity, discuss your topic with your professor and your class mates.

2. Decide on the scope of your review

How many studies do you need to look at? How comprehensive should it be? How many years should it cover? 

  • This may depend on your assignment.  How many sources does the assignment require?

3. Select the databases you will use to conduct your searches.

Make a list of the databases you will search. 

Where to find databases:

  • use the tabs on this guide
  • Find other databases in the Nursing Information Resources web page
  • More on the Medical Library web page
  • ... and more on the Yale University Library web page

4. Conduct your searches to find the evidence. Keep track of your searches.

  • Use the key words in your question, as well as synonyms for those words, as terms in your search. Use the database tutorials for help.
  • Save the searches in the databases. This saves time when you want to redo, or modify, the searches. It is also helpful to use as a guide is the searches are not finding any useful results.
  • Review the abstracts of research studies carefully. This will save you time.
  • Use the bibliographies and references of research studies you find to locate others.
  • Check with your professor, or a subject expert in the field, if you are missing any key works in the field.
  • Ask your librarian for help at any time.
  • Use a citation manager, such as EndNote as the repository for your citations. See the EndNote tutorials for help.

Review the literature

Some questions to help you analyze the research:

  • What was the research question of the study you are reviewing? What were the authors trying to discover?
  • Was the research funded by a source that could influence the findings?
  • What were the research methodologies? Analyze its literature review, the samples and variables used, the results, and the conclusions.
  • Does the research seem to be complete? Could it have been conducted more soundly? What further questions does it raise?
  • If there are conflicting studies, why do you think that is?
  • How are the authors viewed in the field? Has this study been cited? If so, how has it been analyzed?

Tips: 

  • Review the abstracts carefully.  
  • Keep careful notes so that you may track your thought processes during the research process.
  • Create a matrix of the studies for easy analysis, and synthesis, across all of the studies.
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Learn how to write a review of literature

What is a review of literature.

The format of a review of literature may vary from discipline to discipline and from assignment to assignment.

A review may be a self-contained unit — an end in itself — or a preface to and rationale for engaging in primary research. A review is a required part of grant and research proposals and often a chapter in theses and dissertations.

Generally, the purpose of a review is to analyze critically a segment of a published body of knowledge through summary, classification, and comparison of prior research studies, reviews of literature, and theoretical articles.

Writing the introduction

In the introduction, you should:

Define or identify the general topic, issue, or area of concern, thus providing an appropriate context for reviewing the literature.

Point out overall trends in what has been published about the topic; or conflicts in theory, methodology, evidence, and conclusions; or gaps in research and scholarship; or a single problem or new perspective of immediate interest.

Establish the writer’s reason (point of view) for reviewing the literature; explain the criteria to be used in analyzing and comparing literature and the organization of the review (sequence); and, when necessary, state why certain literature is or is not included (scope).

Writing the body

In the body, you should:

Group research studies and other types of literature (reviews, theoretical articles, case studies, etc.) according to common denominators such as qualitative versus quantitative approaches, conclusions of authors, specific purpose or objective, chronology, etc.

Summarize individual studies or articles with as much or as little detail as each merits according to its comparative importance in the literature, remembering that space (length) denotes significance.

Provide the reader with strong “umbrella” sentences at beginnings of paragraphs, “signposts” throughout, and brief “so what” summary sentences at intermediate points in the review to aid in understanding comparisons and analyses.

Writing the conclusion

In the conclusion, you should:

Summarize major contributions of significant studies and articles to the body of knowledge under review, maintaining the focus established in the introduction.

Evaluate the current “state of the art” for the body of knowledge reviewed, pointing out major methodological flaws or gaps in research, inconsistencies in theory and findings, and areas or issues pertinent to future study.

Conclude by providing some insight into the relationship between the central topic of the literature review and a larger area of study such as a discipline, a scientific endeavor, or a profession.

For further information see our handouts on Writing a Critical Review of a Nonfiction Book or Article or Reading a Book to Review It .

To learn more about literature reviews, take a look at our workshop on Writing Literature Reviews of Published Research.

Sample Literature Reviews

An important strategy for learning how to compose literature reviews in your field or within a specific genre is to locate and analyze representative examples. The following collection of annotated sample literature reviews written and co-written by colleagues associated with UW-Madison showcases how these reviews can do different kind of work for different purposes. Use these successful examples as a starting point for understanding how other writers have approached the challenging and important task of situating their idea in the context of established research.

  • Sample 1 (PDF) A brief literature review within a political scientists’  National Science Foundation Graduate Research Fellowship  grant
  • Sample 2 (PDF) A several-page literature review at the beginning of a published, academic article about philosophy
  • Sample 3 (PDF) A brief literature review at the beginning of a published, academic article about photochemistry

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Literature Reviews

What this handout is about.

This handout will explain what literature reviews are and offer insights into the form and construction of literature reviews in the humanities, social sciences, and sciences.

Introduction

OK. You’ve got to write a literature review. You dust off a novel and a book of poetry, settle down in your chair, and get ready to issue a “thumbs up” or “thumbs down” as you leaf through the pages. “Literature review” done. Right?

Wrong! The “literature” of a literature review refers to any collection of materials on a topic, not necessarily the great literary texts of the world. “Literature” could be anything from a set of government pamphlets on British colonial methods in Africa to scholarly articles on the treatment of a torn ACL. And a review does not necessarily mean that your reader wants you to give your personal opinion on whether or not you liked these sources.

What is a literature review, then?

A literature review discusses published information in a particular subject area, and sometimes information in a particular subject area within a certain time period.

A literature review can be just a simple summary of the sources, but it usually has an organizational pattern and combines both summary and synthesis. A summary is a recap of the important information of the source, but a synthesis is a re-organization, or a reshuffling, of that information. It might give a new interpretation of old material or combine new with old interpretations. Or it might trace the intellectual progression of the field, including major debates. And depending on the situation, the literature review may evaluate the sources and advise the reader on the most pertinent or relevant.

But how is a literature review different from an academic research paper?

The main focus of an academic research paper is to develop a new argument, and a research paper is likely to contain a literature review as one of its parts. In a research paper, you use the literature as a foundation and as support for a new insight that you contribute. The focus of a literature review, however, is to summarize and synthesize the arguments and ideas of others without adding new contributions.

Why do we write literature reviews?

Literature reviews provide you with a handy guide to a particular topic. If you have limited time to conduct research, literature reviews can give you an overview or act as a stepping stone. For professionals, they are useful reports that keep them up to date with what is current in the field. For scholars, the depth and breadth of the literature review emphasizes the credibility of the writer in his or her field. Literature reviews also provide a solid background for a research paper’s investigation. Comprehensive knowledge of the literature of the field is essential to most research papers.

Who writes these things, anyway?

Literature reviews are written occasionally in the humanities, but mostly in the sciences and social sciences; in experiment and lab reports, they constitute a section of the paper. Sometimes a literature review is written as a paper in itself.

Let’s get to it! What should I do before writing the literature review?

If your assignment is not very specific, seek clarification from your instructor:

  • Roughly how many sources should you include?
  • What types of sources (books, journal articles, websites)?
  • Should you summarize, synthesize, or critique your sources by discussing a common theme or issue?
  • Should you evaluate your sources?
  • Should you provide subheadings and other background information, such as definitions and/or a history?

Find models

Look for other literature reviews in your area of interest or in the discipline and read them to get a sense of the types of themes you might want to look for in your own research or ways to organize your final review. You can simply put the word “review” in your search engine along with your other topic terms to find articles of this type on the Internet or in an electronic database. The bibliography or reference section of sources you’ve already read are also excellent entry points into your own research.

Narrow your topic

There are hundreds or even thousands of articles and books on most areas of study. The narrower your topic, the easier it will be to limit the number of sources you need to read in order to get a good survey of the material. Your instructor will probably not expect you to read everything that’s out there on the topic, but you’ll make your job easier if you first limit your scope.

Keep in mind that UNC Libraries have research guides and to databases relevant to many fields of study. You can reach out to the subject librarian for a consultation: https://library.unc.edu/support/consultations/ .

And don’t forget to tap into your professor’s (or other professors’) knowledge in the field. Ask your professor questions such as: “If you had to read only one book from the 90’s on topic X, what would it be?” Questions such as this help you to find and determine quickly the most seminal pieces in the field.

Consider whether your sources are current

Some disciplines require that you use information that is as current as possible. In the sciences, for instance, treatments for medical problems are constantly changing according to the latest studies. Information even two years old could be obsolete. However, if you are writing a review in the humanities, history, or social sciences, a survey of the history of the literature may be what is needed, because what is important is how perspectives have changed through the years or within a certain time period. Try sorting through some other current bibliographies or literature reviews in the field to get a sense of what your discipline expects. You can also use this method to consider what is currently of interest to scholars in this field and what is not.

Strategies for writing the literature review

Find a focus.

A literature review, like a term paper, is usually organized around ideas, not the sources themselves as an annotated bibliography would be organized. This means that you will not just simply list your sources and go into detail about each one of them, one at a time. No. As you read widely but selectively in your topic area, consider instead what themes or issues connect your sources together. Do they present one or different solutions? Is there an aspect of the field that is missing? How well do they present the material and do they portray it according to an appropriate theory? Do they reveal a trend in the field? A raging debate? Pick one of these themes to focus the organization of your review.

Convey it to your reader

A literature review may not have a traditional thesis statement (one that makes an argument), but you do need to tell readers what to expect. Try writing a simple statement that lets the reader know what is your main organizing principle. Here are a couple of examples:

The current trend in treatment for congestive heart failure combines surgery and medicine. More and more cultural studies scholars are accepting popular media as a subject worthy of academic consideration.

Consider organization

You’ve got a focus, and you’ve stated it clearly and directly. Now what is the most effective way of presenting the information? What are the most important topics, subtopics, etc., that your review needs to include? And in what order should you present them? Develop an organization for your review at both a global and local level:

First, cover the basic categories

Just like most academic papers, literature reviews also must contain at least three basic elements: an introduction or background information section; the body of the review containing the discussion of sources; and, finally, a conclusion and/or recommendations section to end the paper. The following provides a brief description of the content of each:

  • Introduction: Gives a quick idea of the topic of the literature review, such as the central theme or organizational pattern.
  • Body: Contains your discussion of sources and is organized either chronologically, thematically, or methodologically (see below for more information on each).
  • Conclusions/Recommendations: Discuss what you have drawn from reviewing literature so far. Where might the discussion proceed?

Organizing the body

Once you have the basic categories in place, then you must consider how you will present the sources themselves within the body of your paper. Create an organizational method to focus this section even further.

To help you come up with an overall organizational framework for your review, consider the following scenario:

You’ve decided to focus your literature review on materials dealing with sperm whales. This is because you’ve just finished reading Moby Dick, and you wonder if that whale’s portrayal is really real. You start with some articles about the physiology of sperm whales in biology journals written in the 1980’s. But these articles refer to some British biological studies performed on whales in the early 18th century. So you check those out. Then you look up a book written in 1968 with information on how sperm whales have been portrayed in other forms of art, such as in Alaskan poetry, in French painting, or on whale bone, as the whale hunters in the late 19th century used to do. This makes you wonder about American whaling methods during the time portrayed in Moby Dick, so you find some academic articles published in the last five years on how accurately Herman Melville portrayed the whaling scene in his novel.

Now consider some typical ways of organizing the sources into a review:

  • Chronological: If your review follows the chronological method, you could write about the materials above according to when they were published. For instance, first you would talk about the British biological studies of the 18th century, then about Moby Dick, published in 1851, then the book on sperm whales in other art (1968), and finally the biology articles (1980s) and the recent articles on American whaling of the 19th century. But there is relatively no continuity among subjects here. And notice that even though the sources on sperm whales in other art and on American whaling are written recently, they are about other subjects/objects that were created much earlier. Thus, the review loses its chronological focus.
  • By publication: Order your sources by publication chronology, then, only if the order demonstrates a more important trend. For instance, you could order a review of literature on biological studies of sperm whales if the progression revealed a change in dissection practices of the researchers who wrote and/or conducted the studies.
  • By trend: A better way to organize the above sources chronologically is to examine the sources under another trend, such as the history of whaling. Then your review would have subsections according to eras within this period. For instance, the review might examine whaling from pre-1600-1699, 1700-1799, and 1800-1899. Under this method, you would combine the recent studies on American whaling in the 19th century with Moby Dick itself in the 1800-1899 category, even though the authors wrote a century apart.
  • Thematic: Thematic reviews of literature are organized around a topic or issue, rather than the progression of time. However, progression of time may still be an important factor in a thematic review. For instance, the sperm whale review could focus on the development of the harpoon for whale hunting. While the study focuses on one topic, harpoon technology, it will still be organized chronologically. The only difference here between a “chronological” and a “thematic” approach is what is emphasized the most: the development of the harpoon or the harpoon technology.But more authentic thematic reviews tend to break away from chronological order. For instance, a thematic review of material on sperm whales might examine how they are portrayed as “evil” in cultural documents. The subsections might include how they are personified, how their proportions are exaggerated, and their behaviors misunderstood. A review organized in this manner would shift between time periods within each section according to the point made.
  • Methodological: A methodological approach differs from the two above in that the focusing factor usually does not have to do with the content of the material. Instead, it focuses on the “methods” of the researcher or writer. For the sperm whale project, one methodological approach would be to look at cultural differences between the portrayal of whales in American, British, and French art work. Or the review might focus on the economic impact of whaling on a community. A methodological scope will influence either the types of documents in the review or the way in which these documents are discussed. Once you’ve decided on the organizational method for the body of the review, the sections you need to include in the paper should be easy to figure out. They should arise out of your organizational strategy. In other words, a chronological review would have subsections for each vital time period. A thematic review would have subtopics based upon factors that relate to the theme or issue.

Sometimes, though, you might need to add additional sections that are necessary for your study, but do not fit in the organizational strategy of the body. What other sections you include in the body is up to you. Put in only what is necessary. Here are a few other sections you might want to consider:

  • Current Situation: Information necessary to understand the topic or focus of the literature review.
  • History: The chronological progression of the field, the literature, or an idea that is necessary to understand the literature review, if the body of the literature review is not already a chronology.
  • Methods and/or Standards: The criteria you used to select the sources in your literature review or the way in which you present your information. For instance, you might explain that your review includes only peer-reviewed articles and journals.

Questions for Further Research: What questions about the field has the review sparked? How will you further your research as a result of the review?

Begin composing

Once you’ve settled on a general pattern of organization, you’re ready to write each section. There are a few guidelines you should follow during the writing stage as well. Here is a sample paragraph from a literature review about sexism and language to illuminate the following discussion:

However, other studies have shown that even gender-neutral antecedents are more likely to produce masculine images than feminine ones (Gastil, 1990). Hamilton (1988) asked students to complete sentences that required them to fill in pronouns that agreed with gender-neutral antecedents such as “writer,” “pedestrian,” and “persons.” The students were asked to describe any image they had when writing the sentence. Hamilton found that people imagined 3.3 men to each woman in the masculine “generic” condition and 1.5 men per woman in the unbiased condition. Thus, while ambient sexism accounted for some of the masculine bias, sexist language amplified the effect. (Source: Erika Falk and Jordan Mills, “Why Sexist Language Affects Persuasion: The Role of Homophily, Intended Audience, and Offense,” Women and Language19:2).

Use evidence

In the example above, the writers refer to several other sources when making their point. A literature review in this sense is just like any other academic research paper. Your interpretation of the available sources must be backed up with evidence to show that what you are saying is valid.

Be selective

Select only the most important points in each source to highlight in the review. The type of information you choose to mention should relate directly to the review’s focus, whether it is thematic, methodological, or chronological.

Use quotes sparingly

Falk and Mills do not use any direct quotes. That is because the survey nature of the literature review does not allow for in-depth discussion or detailed quotes from the text. Some short quotes here and there are okay, though, if you want to emphasize a point, or if what the author said just cannot be rewritten in your own words. Notice that Falk and Mills do quote certain terms that were coined by the author, not common knowledge, or taken directly from the study. But if you find yourself wanting to put in more quotes, check with your instructor.

Summarize and synthesize

Remember to summarize and synthesize your sources within each paragraph as well as throughout the review. The authors here recapitulate important features of Hamilton’s study, but then synthesize it by rephrasing the study’s significance and relating it to their own work.

Keep your own voice

While the literature review presents others’ ideas, your voice (the writer’s) should remain front and center. Notice that Falk and Mills weave references to other sources into their own text, but they still maintain their own voice by starting and ending the paragraph with their own ideas and their own words. The sources support what Falk and Mills are saying.

Use caution when paraphrasing

When paraphrasing a source that is not your own, be sure to represent the author’s information or opinions accurately and in your own words. In the preceding example, Falk and Mills either directly refer in the text to the author of their source, such as Hamilton, or they provide ample notation in the text when the ideas they are mentioning are not their own, for example, Gastil’s. For more information, please see our handout on plagiarism .

Revise, revise, revise

Draft in hand? Now you’re ready to revise. Spending a lot of time revising is a wise idea, because your main objective is to present the material, not the argument. So check over your review again to make sure it follows the assignment and/or your outline. Then, just as you would for most other academic forms of writing, rewrite or rework the language of your review so that you’ve presented your information in the most concise manner possible. Be sure to use terminology familiar to your audience; get rid of unnecessary jargon or slang. Finally, double check that you’ve documented your sources and formatted the review appropriately for your discipline. For tips on the revising and editing process, see our handout on revising drafts .

Works consulted

We consulted these works while writing this handout. This is not a comprehensive list of resources on the handout’s topic, and we encourage you to do your own research to find additional publications. Please do not use this list as a model for the format of your own reference list, as it may not match the citation style you are using. For guidance on formatting citations, please see the UNC Libraries citation tutorial . We revise these tips periodically and welcome feedback.

Anson, Chris M., and Robert A. Schwegler. 2010. The Longman Handbook for Writers and Readers , 6th ed. New York: Longman.

Jones, Robert, Patrick Bizzaro, and Cynthia Selfe. 1997. The Harcourt Brace Guide to Writing in the Disciplines . New York: Harcourt Brace.

Lamb, Sandra E. 1998. How to Write It: A Complete Guide to Everything You’ll Ever Write . Berkeley: Ten Speed Press.

Rosen, Leonard J., and Laurence Behrens. 2003. The Allyn & Bacon Handbook , 5th ed. New York: Longman.

Troyka, Lynn Quittman, and Doug Hesse. 2016. Simon and Schuster Handbook for Writers , 11th ed. London: Pearson.

You may reproduce it for non-commercial use if you use the entire handout and attribute the source: The Writing Center, University of North Carolina at Chapel Hill

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  • What is a Literature Review? | Guide, Template, & Examples

What is a Literature Review? | Guide, Template, & Examples

Published on 22 February 2022 by Shona McCombes . Revised on 7 June 2022.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research.

There are five key steps to writing a literature review:

  • Search for relevant literature
  • Evaluate sources
  • Identify themes, debates and gaps
  • Outline the structure
  • Write your literature review

A good literature review doesn’t just summarise sources – it analyses, synthesises, and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

Why write a literature review, examples of literature reviews, step 1: search for relevant literature, step 2: evaluate and select sources, step 3: identify themes, debates and gaps, step 4: outline your literature review’s structure, step 5: write your literature review, frequently asked questions about literature reviews, introduction.

  • Quick Run-through
  • Step 1 & 2

When you write a dissertation or thesis, you will have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

  • Demonstrate your familiarity with the topic and scholarly context
  • Develop a theoretical framework and methodology for your research
  • Position yourself in relation to other researchers and theorists
  • Show how your dissertation addresses a gap or contributes to a debate

You might also have to write a literature review as a stand-alone assignment. In this case, the purpose is to evaluate the current state of research and demonstrate your knowledge of scholarly debates around a topic.

The content will look slightly different in each case, but the process of conducting a literature review follows the same steps. We’ve written a step-by-step guide that you can follow below.

Literature review guide

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

  • Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
  • Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
  • Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
  • Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research objectives and questions .

If you are writing a literature review as a stand-alone assignment, you will have to choose a focus and develop a central question to direct your search. Unlike a dissertation research question, this question has to be answerable without collecting original data. You should be able to answer it based only on a review of existing publications.

Make a list of keywords

Start by creating a list of keywords related to your research topic. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list if you discover new keywords in the process of your literature search.

  • Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
  • Body image, self-perception, self-esteem, mental health
  • Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some databases to search for journals and articles include:

  • Your university’s library catalogue
  • Google Scholar
  • Project Muse (humanities and social sciences)
  • Medline (life sciences and biomedicine)
  • EconLit (economics)
  • Inspec (physics, engineering and computer science)

You can use boolean operators to help narrow down your search:

Read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

To identify the most important publications on your topic, take note of recurring citations. If the same authors, books or articles keep appearing in your reading, make sure to seek them out.

You probably won’t be able to read absolutely everything that has been written on the topic – you’ll have to evaluate which sources are most relevant to your questions.

For each publication, ask yourself:

  • What question or problem is the author addressing?
  • What are the key concepts and how are they defined?
  • What are the key theories, models and methods? Does the research use established frameworks or take an innovative approach?
  • What are the results and conclusions of the study?
  • How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
  • How does the publication contribute to your understanding of the topic? What are its key insights and arguments?
  • What are the strengths and weaknesses of the research?

Make sure the sources you use are credible, and make sure you read any landmark studies and major theories in your field of research.

You can find out how many times an article has been cited on Google Scholar – a high citation count means the article has been influential in the field, and should certainly be included in your literature review.

The scope of your review will depend on your topic and discipline: in the sciences you usually only review recent literature, but in the humanities you might take a long historical perspective (for example, to trace how a concept has changed in meaning over time).

Remember that you can use our template to summarise and evaluate sources you’re thinking about using!

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It’s important to keep track of your sources with references to avoid plagiarism . It can be helpful to make an annotated bibliography, where you compile full reference information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

You can use our free APA Reference Generator for quick, correct, consistent citations.

Prevent plagiarism, run a free check.

To begin organising your literature review’s argument and structure, you need to understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

  • Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
  • Themes: what questions or concepts recur across the literature?
  • Debates, conflicts and contradictions: where do sources disagree?
  • Pivotal publications: are there any influential theories or studies that changed the direction of the field?
  • Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

  • Most research has focused on young women.
  • There is an increasing interest in the visual aspects of social media.
  • But there is still a lack of robust research on highly-visual platforms like Instagram and Snapchat – this is a gap that you could address in your own research.

There are various approaches to organising the body of a literature review. You should have a rough idea of your strategy before you start writing.

Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarising sources in order.

Try to analyse patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organise your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

  • Look at what results have emerged in qualitative versus quantitative research
  • Discuss how the topic has been approached by empirical versus theoretical scholarship
  • Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text, your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

If you are writing the literature review as part of your dissertation or thesis, reiterate your central problem or research question and give a brief summary of the scholarly context. You can emphasise the timeliness of the topic (“many recent studies have focused on the problem of x”) or highlight a gap in the literature (“while there has been much research on x, few researchers have taken y into consideration”).

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, make sure to follow these tips:

  • Summarise and synthesise: give an overview of the main points of each source and combine them into a coherent whole.
  • Analyse and interpret: don’t just paraphrase other researchers – add your own interpretations, discussing the significance of findings in relation to the literature as a whole.
  • Critically evaluate: mention the strengths and weaknesses of your sources.
  • Write in well-structured paragraphs: use transitions and topic sentences to draw connections, comparisons and contrasts.

In the conclusion, you should summarise the key findings you have taken from the literature and emphasise their significance.

If the literature review is part of your dissertation or thesis, reiterate how your research addresses gaps and contributes new knowledge, or discuss how you have drawn on existing theories and methods to build a framework for your research. This can lead directly into your methodology section.

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a dissertation , thesis, research paper , or proposal .

There are several reasons to conduct a literature review at the beginning of a research project:

  • To familiarise yourself with the current state of knowledge on your topic
  • To ensure that you’re not just repeating what others have already done
  • To identify gaps in knowledge and unresolved problems that your research can address
  • To develop your theoretical framework and methodology
  • To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your  dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

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  • 04 December 2020
  • Correction 09 December 2020

How to write a superb literature review

Andy Tay is a freelance writer based in Singapore.

You can also search for this author in PubMed   Google Scholar

Literature reviews are important resources for scientists. They provide historical context for a field while offering opinions on its future trajectory. Creating them can provide inspiration for one’s own research, as well as some practice in writing. But few scientists are trained in how to write a review — or in what constitutes an excellent one. Even picking the appropriate software to use can be an involved decision (see ‘Tools and techniques’). So Nature asked editors and working scientists with well-cited reviews for their tips.

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doi: https://doi.org/10.1038/d41586-020-03422-x

Interviews have been edited for length and clarity.

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Correction 09 December 2020 : An earlier version of the tables in this article included some incorrect details about the programs Zotero, Endnote and Manubot. These have now been corrected.

Hsing, I.-M., Xu, Y. & Zhao, W. Electroanalysis 19 , 755–768 (2007).

Article   Google Scholar  

Ledesma, H. A. et al. Nature Nanotechnol. 14 , 645–657 (2019).

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Brahlek, M., Koirala, N., Bansal, N. & Oh, S. Solid State Commun. 215–216 , 54–62 (2015).

Choi, Y. & Lee, S. Y. Nature Rev. Chem . https://doi.org/10.1038/s41570-020-00221-w (2020).

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Literature Reviews

  • Getting started

What is a literature review?

Why conduct a literature review, stages of a literature review, lit reviews: an overview (video), check out these books.

  • Types of reviews
  • 1. Define your research question
  • 2. Plan your search
  • 3. Search the literature
  • 4. Organize your results
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review of literature of a research report

Definition: A literature review is a systematic examination and synthesis of existing scholarly research on a specific topic or subject.

Purpose: It serves to provide a comprehensive overview of the current state of knowledge within a particular field.

Analysis: Involves critically evaluating and summarizing key findings, methodologies, and debates found in academic literature.

Identifying Gaps: Aims to pinpoint areas where there is a lack of research or unresolved questions, highlighting opportunities for further investigation.

Contextualization: Enables researchers to understand how their work fits into the broader academic conversation and contributes to the existing body of knowledge.

review of literature of a research report

tl;dr  A literature review critically examines and synthesizes existing scholarly research and publications on a specific topic to provide a comprehensive understanding of the current state of knowledge in the field.

What is a literature review NOT?

❌ An annotated bibliography

❌ Original research

❌ A summary

❌ Something to be conducted at the end of your research

❌ An opinion piece

❌ A chronological compilation of studies

The reason for conducting a literature review is to:

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Literature Reviews: An Overview for Graduate Students

While this 9-minute video from NCSU is geared toward graduate students, it is useful for anyone conducting a literature review.

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Writing the literature review: A practical guide

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Writing literature reviews: A guide for students of the social and behavioral sciences

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Telling a research story: Writing a literature review

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The literature review: Six steps to success

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Systematic approaches to a successful literature review

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Organizing Your Social Sciences Research Paper

  • 5. The Literature Review
  • Purpose of Guide
  • Design Flaws to Avoid
  • Independent and Dependent Variables
  • Glossary of Research Terms
  • Reading Research Effectively
  • Narrowing a Topic Idea
  • Broadening a Topic Idea
  • Extending the Timeliness of a Topic Idea
  • Academic Writing Style
  • Choosing a Title
  • Making an Outline
  • Paragraph Development
  • Research Process Video Series
  • Executive Summary
  • The C.A.R.S. Model
  • Background Information
  • The Research Problem/Question
  • Theoretical Framework
  • Citation Tracking
  • Content Alert Services
  • Evaluating Sources
  • Primary Sources
  • Secondary Sources
  • Tiertiary Sources
  • Scholarly vs. Popular Publications
  • Qualitative Methods
  • Quantitative Methods
  • Insiderness
  • Using Non-Textual Elements
  • Limitations of the Study
  • Common Grammar Mistakes
  • Writing Concisely
  • Avoiding Plagiarism
  • Footnotes or Endnotes?
  • Further Readings
  • Generative AI and Writing
  • USC Libraries Tutorials and Other Guides
  • Bibliography

A literature review surveys prior research published in books, scholarly articles, and any other sources relevant to a particular issue, area of research, or theory, and by so doing, provides a description, summary, and critical evaluation of these works in relation to the research problem being investigated. Literature reviews are designed to provide an overview of sources you have used in researching a particular topic and to demonstrate to your readers how your research fits within existing scholarship about the topic.

Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . Fourth edition. Thousand Oaks, CA: SAGE, 2014.

Importance of a Good Literature Review

A literature review may consist of simply a summary of key sources, but in the social sciences, a literature review usually has an organizational pattern and combines both summary and synthesis, often within specific conceptual categories . A summary is a recap of the important information of the source, but a synthesis is a re-organization, or a reshuffling, of that information in a way that informs how you are planning to investigate a research problem. The analytical features of a literature review might:

  • Give a new interpretation of old material or combine new with old interpretations,
  • Trace the intellectual progression of the field, including major debates,
  • Depending on the situation, evaluate the sources and advise the reader on the most pertinent or relevant research, or
  • Usually in the conclusion of a literature review, identify where gaps exist in how a problem has been researched to date.

Given this, the purpose of a literature review is to:

  • Place each work in the context of its contribution to understanding the research problem being studied.
  • Describe the relationship of each work to the others under consideration.
  • Identify new ways to interpret prior research.
  • Reveal any gaps that exist in the literature.
  • Resolve conflicts amongst seemingly contradictory previous studies.
  • Identify areas of prior scholarship to prevent duplication of effort.
  • Point the way in fulfilling a need for additional research.
  • Locate your own research within the context of existing literature [very important].

Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper. 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Jesson, Jill. Doing Your Literature Review: Traditional and Systematic Techniques . Los Angeles, CA: SAGE, 2011; Knopf, Jeffrey W. "Doing a Literature Review." PS: Political Science and Politics 39 (January 2006): 127-132; Ridley, Diana. The Literature Review: A Step-by-Step Guide for Students . 2nd ed. Los Angeles, CA: SAGE, 2012.

Types of Literature Reviews

It is important to think of knowledge in a given field as consisting of three layers. First, there are the primary studies that researchers conduct and publish. Second are the reviews of those studies that summarize and offer new interpretations built from and often extending beyond the primary studies. Third, there are the perceptions, conclusions, opinion, and interpretations that are shared informally among scholars that become part of the body of epistemological traditions within the field.

In composing a literature review, it is important to note that it is often this third layer of knowledge that is cited as "true" even though it often has only a loose relationship to the primary studies and secondary literature reviews. Given this, while literature reviews are designed to provide an overview and synthesis of pertinent sources you have explored, there are a number of approaches you could adopt depending upon the type of analysis underpinning your study.

Argumentative Review This form examines literature selectively in order to support or refute an argument, deeply embedded assumption, or philosophical problem already established in the literature. The purpose is to develop a body of literature that establishes a contrarian viewpoint. Given the value-laden nature of some social science research [e.g., educational reform; immigration control], argumentative approaches to analyzing the literature can be a legitimate and important form of discourse. However, note that they can also introduce problems of bias when they are used to make summary claims of the sort found in systematic reviews [see below].

Integrative Review Considered a form of research that reviews, critiques, and synthesizes representative literature on a topic in an integrated way such that new frameworks and perspectives on the topic are generated. The body of literature includes all studies that address related or identical hypotheses or research problems. A well-done integrative review meets the same standards as primary research in regard to clarity, rigor, and replication. This is the most common form of review in the social sciences.

Historical Review Few things rest in isolation from historical precedent. Historical literature reviews focus on examining research throughout a period of time, often starting with the first time an issue, concept, theory, phenomena emerged in the literature, then tracing its evolution within the scholarship of a discipline. The purpose is to place research in a historical context to show familiarity with state-of-the-art developments and to identify the likely directions for future research.

Methodological Review A review does not always focus on what someone said [findings], but how they came about saying what they say [method of analysis]. Reviewing methods of analysis provides a framework of understanding at different levels [i.e. those of theory, substantive fields, research approaches, and data collection and analysis techniques], how researchers draw upon a wide variety of knowledge ranging from the conceptual level to practical documents for use in fieldwork in the areas of ontological and epistemological consideration, quantitative and qualitative integration, sampling, interviewing, data collection, and data analysis. This approach helps highlight ethical issues which you should be aware of and consider as you go through your own study.

Systematic Review This form consists of an overview of existing evidence pertinent to a clearly formulated research question, which uses pre-specified and standardized methods to identify and critically appraise relevant research, and to collect, report, and analyze data from the studies that are included in the review. The goal is to deliberately document, critically evaluate, and summarize scientifically all of the research about a clearly defined research problem . Typically it focuses on a very specific empirical question, often posed in a cause-and-effect form, such as "To what extent does A contribute to B?" This type of literature review is primarily applied to examining prior research studies in clinical medicine and allied health fields, but it is increasingly being used in the social sciences.

Theoretical Review The purpose of this form is to examine the corpus of theory that has accumulated in regard to an issue, concept, theory, phenomena. The theoretical literature review helps to establish what theories already exist, the relationships between them, to what degree the existing theories have been investigated, and to develop new hypotheses to be tested. Often this form is used to help establish a lack of appropriate theories or reveal that current theories are inadequate for explaining new or emerging research problems. The unit of analysis can focus on a theoretical concept or a whole theory or framework.

NOTE : Most often the literature review will incorporate some combination of types. For example, a review that examines literature supporting or refuting an argument, assumption, or philosophical problem related to the research problem will also need to include writing supported by sources that establish the history of these arguments in the literature.

Baumeister, Roy F. and Mark R. Leary. "Writing Narrative Literature Reviews."  Review of General Psychology 1 (September 1997): 311-320; Mark R. Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Kennedy, Mary M. "Defining a Literature." Educational Researcher 36 (April 2007): 139-147; Petticrew, Mark and Helen Roberts. Systematic Reviews in the Social Sciences: A Practical Guide . Malden, MA: Blackwell Publishers, 2006; Torracro, Richard. "Writing Integrative Literature Reviews: Guidelines and Examples." Human Resource Development Review 4 (September 2005): 356-367; Rocco, Tonette S. and Maria S. Plakhotnik. "Literature Reviews, Conceptual Frameworks, and Theoretical Frameworks: Terms, Functions, and Distinctions." Human Ressource Development Review 8 (March 2008): 120-130; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016.

Structure and Writing Style

I.  Thinking About Your Literature Review

The structure of a literature review should include the following in support of understanding the research problem :

  • An overview of the subject, issue, or theory under consideration, along with the objectives of the literature review,
  • Division of works under review into themes or categories [e.g. works that support a particular position, those against, and those offering alternative approaches entirely],
  • An explanation of how each work is similar to and how it varies from the others,
  • Conclusions as to which pieces are best considered in their argument, are most convincing of their opinions, and make the greatest contribution to the understanding and development of their area of research.

The critical evaluation of each work should consider :

  • Provenance -- what are the author's credentials? Are the author's arguments supported by evidence [e.g. primary historical material, case studies, narratives, statistics, recent scientific findings]?
  • Methodology -- were the techniques used to identify, gather, and analyze the data appropriate to addressing the research problem? Was the sample size appropriate? Were the results effectively interpreted and reported?
  • Objectivity -- is the author's perspective even-handed or prejudicial? Is contrary data considered or is certain pertinent information ignored to prove the author's point?
  • Persuasiveness -- which of the author's theses are most convincing or least convincing?
  • Validity -- are the author's arguments and conclusions convincing? Does the work ultimately contribute in any significant way to an understanding of the subject?

II.  Development of the Literature Review

Four Basic Stages of Writing 1.  Problem formulation -- which topic or field is being examined and what are its component issues? 2.  Literature search -- finding materials relevant to the subject being explored. 3.  Data evaluation -- determining which literature makes a significant contribution to the understanding of the topic. 4.  Analysis and interpretation -- discussing the findings and conclusions of pertinent literature.

Consider the following issues before writing the literature review: Clarify If your assignment is not specific about what form your literature review should take, seek clarification from your professor by asking these questions: 1.  Roughly how many sources would be appropriate to include? 2.  What types of sources should I review (books, journal articles, websites; scholarly versus popular sources)? 3.  Should I summarize, synthesize, or critique sources by discussing a common theme or issue? 4.  Should I evaluate the sources in any way beyond evaluating how they relate to understanding the research problem? 5.  Should I provide subheadings and other background information, such as definitions and/or a history? Find Models Use the exercise of reviewing the literature to examine how authors in your discipline or area of interest have composed their literature review sections. Read them to get a sense of the types of themes you might want to look for in your own research or to identify ways to organize your final review. The bibliography or reference section of sources you've already read, such as required readings in the course syllabus, are also excellent entry points into your own research. Narrow the Topic The narrower your topic, the easier it will be to limit the number of sources you need to read in order to obtain a good survey of relevant resources. Your professor will probably not expect you to read everything that's available about the topic, but you'll make the act of reviewing easier if you first limit scope of the research problem. A good strategy is to begin by searching the USC Libraries Catalog for recent books about the topic and review the table of contents for chapters that focuses on specific issues. You can also review the indexes of books to find references to specific issues that can serve as the focus of your research. For example, a book surveying the history of the Israeli-Palestinian conflict may include a chapter on the role Egypt has played in mediating the conflict, or look in the index for the pages where Egypt is mentioned in the text. Consider Whether Your Sources are Current Some disciplines require that you use information that is as current as possible. This is particularly true in disciplines in medicine and the sciences where research conducted becomes obsolete very quickly as new discoveries are made. However, when writing a review in the social sciences, a survey of the history of the literature may be required. In other words, a complete understanding the research problem requires you to deliberately examine how knowledge and perspectives have changed over time. Sort through other current bibliographies or literature reviews in the field to get a sense of what your discipline expects. You can also use this method to explore what is considered by scholars to be a "hot topic" and what is not.

III.  Ways to Organize Your Literature Review

Chronology of Events If your review follows the chronological method, you could write about the materials according to when they were published. This approach should only be followed if a clear path of research building on previous research can be identified and that these trends follow a clear chronological order of development. For example, a literature review that focuses on continuing research about the emergence of German economic power after the fall of the Soviet Union. By Publication Order your sources by publication chronology, then, only if the order demonstrates a more important trend. For instance, you could order a review of literature on environmental studies of brown fields if the progression revealed, for example, a change in the soil collection practices of the researchers who wrote and/or conducted the studies. Thematic [“conceptual categories”] A thematic literature review is the most common approach to summarizing prior research in the social and behavioral sciences. Thematic reviews are organized around a topic or issue, rather than the progression of time, although the progression of time may still be incorporated into a thematic review. For example, a review of the Internet’s impact on American presidential politics could focus on the development of online political satire. While the study focuses on one topic, the Internet’s impact on American presidential politics, it would still be organized chronologically reflecting technological developments in media. The difference in this example between a "chronological" and a "thematic" approach is what is emphasized the most: themes related to the role of the Internet in presidential politics. Note that more authentic thematic reviews tend to break away from chronological order. A review organized in this manner would shift between time periods within each section according to the point being made. Methodological A methodological approach focuses on the methods utilized by the researcher. For the Internet in American presidential politics project, one methodological approach would be to look at cultural differences between the portrayal of American presidents on American, British, and French websites. Or the review might focus on the fundraising impact of the Internet on a particular political party. A methodological scope will influence either the types of documents in the review or the way in which these documents are discussed.

Other Sections of Your Literature Review Once you've decided on the organizational method for your literature review, the sections you need to include in the paper should be easy to figure out because they arise from your organizational strategy. In other words, a chronological review would have subsections for each vital time period; a thematic review would have subtopics based upon factors that relate to the theme or issue. However, sometimes you may need to add additional sections that are necessary for your study, but do not fit in the organizational strategy of the body. What other sections you include in the body is up to you. However, only include what is necessary for the reader to locate your study within the larger scholarship about the research problem.

Here are examples of other sections, usually in the form of a single paragraph, you may need to include depending on the type of review you write:

  • Current Situation : Information necessary to understand the current topic or focus of the literature review.
  • Sources Used : Describes the methods and resources [e.g., databases] you used to identify the literature you reviewed.
  • History : The chronological progression of the field, the research literature, or an idea that is necessary to understand the literature review, if the body of the literature review is not already a chronology.
  • Selection Methods : Criteria you used to select (and perhaps exclude) sources in your literature review. For instance, you might explain that your review includes only peer-reviewed [i.e., scholarly] sources.
  • Standards : Description of the way in which you present your information.
  • Questions for Further Research : What questions about the field has the review sparked? How will you further your research as a result of the review?

IV.  Writing Your Literature Review

Once you've settled on how to organize your literature review, you're ready to write each section. When writing your review, keep in mind these issues.

Use Evidence A literature review section is, in this sense, just like any other academic research paper. Your interpretation of the available sources must be backed up with evidence [citations] that demonstrates that what you are saying is valid. Be Selective Select only the most important points in each source to highlight in the review. The type of information you choose to mention should relate directly to the research problem, whether it is thematic, methodological, or chronological. Related items that provide additional information, but that are not key to understanding the research problem, can be included in a list of further readings . Use Quotes Sparingly Some short quotes are appropriate if you want to emphasize a point, or if what an author stated cannot be easily paraphrased. Sometimes you may need to quote certain terminology that was coined by the author, is not common knowledge, or taken directly from the study. Do not use extensive quotes as a substitute for using your own words in reviewing the literature. Summarize and Synthesize Remember to summarize and synthesize your sources within each thematic paragraph as well as throughout the review. Recapitulate important features of a research study, but then synthesize it by rephrasing the study's significance and relating it to your own work and the work of others. Keep Your Own Voice While the literature review presents others' ideas, your voice [the writer's] should remain front and center. For example, weave references to other sources into what you are writing but maintain your own voice by starting and ending the paragraph with your own ideas and wording. Use Caution When Paraphrasing When paraphrasing a source that is not your own, be sure to represent the author's information or opinions accurately and in your own words. Even when paraphrasing an author’s work, you still must provide a citation to that work.

V.  Common Mistakes to Avoid

These are the most common mistakes made in reviewing social science research literature.

  • Sources in your literature review do not clearly relate to the research problem;
  • You do not take sufficient time to define and identify the most relevant sources to use in the literature review related to the research problem;
  • Relies exclusively on secondary analytical sources rather than including relevant primary research studies or data;
  • Uncritically accepts another researcher's findings and interpretations as valid, rather than examining critically all aspects of the research design and analysis;
  • Does not describe the search procedures that were used in identifying the literature to review;
  • Reports isolated statistical results rather than synthesizing them in chi-squared or meta-analytic methods; and,
  • Only includes research that validates assumptions and does not consider contrary findings and alternative interpretations found in the literature.

Cook, Kathleen E. and Elise Murowchick. “Do Literature Review Skills Transfer from One Course to Another?” Psychology Learning and Teaching 13 (March 2014): 3-11; Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Jesson, Jill. Doing Your Literature Review: Traditional and Systematic Techniques . London: SAGE, 2011; Literature Review Handout. Online Writing Center. Liberty University; Literature Reviews. The Writing Center. University of North Carolina; Onwuegbuzie, Anthony J. and Rebecca Frels. Seven Steps to a Comprehensive Literature Review: A Multimodal and Cultural Approach . Los Angeles, CA: SAGE, 2016; Ridley, Diana. The Literature Review: A Step-by-Step Guide for Students . 2nd ed. Los Angeles, CA: SAGE, 2012; Randolph, Justus J. “A Guide to Writing the Dissertation Literature Review." Practical Assessment, Research, and Evaluation. vol. 14, June 2009; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016; Taylor, Dena. The Literature Review: A Few Tips On Conducting It. University College Writing Centre. University of Toronto; Writing a Literature Review. Academic Skills Centre. University of Canberra.

Writing Tip

Break Out of Your Disciplinary Box!

Thinking interdisciplinarily about a research problem can be a rewarding exercise in applying new ideas, theories, or concepts to an old problem. For example, what might cultural anthropologists say about the continuing conflict in the Middle East? In what ways might geographers view the need for better distribution of social service agencies in large cities than how social workers might study the issue? You don’t want to substitute a thorough review of core research literature in your discipline for studies conducted in other fields of study. However, particularly in the social sciences, thinking about research problems from multiple vectors is a key strategy for finding new solutions to a problem or gaining a new perspective. Consult with a librarian about identifying research databases in other disciplines; almost every field of study has at least one comprehensive database devoted to indexing its research literature.

Frodeman, Robert. The Oxford Handbook of Interdisciplinarity . New York: Oxford University Press, 2010.

Another Writing Tip

Don't Just Review for Content!

While conducting a review of the literature, maximize the time you devote to writing this part of your paper by thinking broadly about what you should be looking for and evaluating. Review not just what scholars are saying, but how are they saying it. Some questions to ask:

  • How are they organizing their ideas?
  • What methods have they used to study the problem?
  • What theories have been used to explain, predict, or understand their research problem?
  • What sources have they cited to support their conclusions?
  • How have they used non-textual elements [e.g., charts, graphs, figures, etc.] to illustrate key points?

When you begin to write your literature review section, you'll be glad you dug deeper into how the research was designed and constructed because it establishes a means for developing more substantial analysis and interpretation of the research problem.

Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1 998.

Yet Another Writing Tip

When Do I Know I Can Stop Looking and Move On?

Here are several strategies you can utilize to assess whether you've thoroughly reviewed the literature:

  • Look for repeating patterns in the research findings . If the same thing is being said, just by different people, then this likely demonstrates that the research problem has hit a conceptual dead end. At this point consider: Does your study extend current research?  Does it forge a new path? Or, does is merely add more of the same thing being said?
  • Look at sources the authors cite to in their work . If you begin to see the same researchers cited again and again, then this is often an indication that no new ideas have been generated to address the research problem.
  • Search Google Scholar to identify who has subsequently cited leading scholars already identified in your literature review [see next sub-tab]. This is called citation tracking and there are a number of sources that can help you identify who has cited whom, particularly scholars from outside of your discipline. Here again, if the same authors are being cited again and again, this may indicate no new literature has been written on the topic.

Onwuegbuzie, Anthony J. and Rebecca Frels. Seven Steps to a Comprehensive Literature Review: A Multimodal and Cultural Approach . Los Angeles, CA: Sage, 2016; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016.

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How to Write a Literature Review

What is a literature review.

  • What Is the Literature
  • Writing the Review

A literature review is much more than an annotated bibliography or a list of separate reviews of articles and books. It is a critical, analytical summary and synthesis of the current knowledge of a topic. Thus it should compare and relate different theories, findings, etc, rather than just summarize them individually. In addition, it should have a particular focus or theme to organize the review. It does not have to be an exhaustive account of everything published on the topic, but it should discuss all the significant academic literature and other relevant sources important for that focus.

This is meant to be a general guide to writing a literature review: ways to structure one, what to include, how it supplements other research. For more specific help on writing a review, and especially for help on finding the literature to review, sign up for a Personal Research Session .

The specific organization of a literature review depends on the type and purpose of the review, as well as on the specific field or topic being reviewed. But in general, it is a relatively brief but thorough exploration of past and current work on a topic. Rather than a chronological listing of previous work, though, literature reviews are usually organized thematically, such as different theoretical approaches, methodologies, or specific issues or concepts involved in the topic. A thematic organization makes it much easier to examine contrasting perspectives, theoretical approaches, methodologies, findings, etc, and to analyze the strengths and weaknesses of, and point out any gaps in, previous research. And this is the heart of what a literature review is about. A literature review may offer new interpretations, theoretical approaches, or other ideas; if it is part of a research proposal or report it should demonstrate the relationship of the proposed or reported research to others' work; but whatever else it does, it must provide a critical overview of the current state of research efforts. 

Literature reviews are common and very important in the sciences and social sciences. They are less common and have a less important role in the humanities, but they do have a place, especially stand-alone reviews.

Types of Literature Reviews

There are different types of literature reviews, and different purposes for writing a review, but the most common are:

  • Stand-alone literature review articles . These provide an overview and analysis of the current state of research on a topic or question. The goal is to evaluate and compare previous research on a topic to provide an analysis of what is currently known, and also to reveal controversies, weaknesses, and gaps in current work, thus pointing to directions for future research. You can find examples published in any number of academic journals, but there is a series of Annual Reviews of *Subject* which are specifically devoted to literature review articles. Writing a stand-alone review is often an effective way to get a good handle on a topic and to develop ideas for your own research program. For example, contrasting theoretical approaches or conflicting interpretations of findings can be the basis of your research project: can you find evidence supporting one interpretation against another, or can you propose an alternative interpretation that overcomes their limitations?
  • Part of a research proposal . This could be a proposal for a PhD dissertation, a senior thesis, or a class project. It could also be a submission for a grant. The literature review, by pointing out the current issues and questions concerning a topic, is a crucial part of demonstrating how your proposed research will contribute to the field, and thus of convincing your thesis committee to allow you to pursue the topic of your interest or a funding agency to pay for your research efforts.
  • Part of a research report . When you finish your research and write your thesis or paper to present your findings, it should include a literature review to provide the context to which your work is a contribution. Your report, in addition to detailing the methods, results, etc. of your research, should show how your work relates to others' work.

A literature review for a research report is often a revision of the review for a research proposal, which can be a revision of a stand-alone review. Each revision should be a fairly extensive revision. With the increased knowledge of and experience in the topic as you proceed, your understanding of the topic will increase. Thus, you will be in a better position to analyze and critique the literature. In addition, your focus will change as you proceed in your research. Some areas of the literature you initially reviewed will be marginal or irrelevant for your eventual research, and you will need to explore other areas more thoroughly. 

Examples of Literature Reviews

See the series of Annual Reviews of *Subject* which are specifically devoted to literature review articles to find many examples of stand-alone literature reviews in the biomedical, physical, and social sciences. 

Research report articles vary in how they are organized, but a common general structure is to have sections such as:

  • Abstract - Brief summary of the contents of the article
  • Introduction - A explanation of the purpose of the study, a statement of the research question(s) the study intends to address
  • Literature review - A critical assessment of the work done so far on this topic, to show how the current study relates to what has already been done
  • Methods - How the study was carried out (e.g. instruments or equipment, procedures, methods to gather and analyze data)
  • Results - What was found in the course of the study
  • Discussion - What do the results mean
  • Conclusion - State the conclusions and implications of the results, and discuss how it relates to the work reviewed in the literature review; also, point to directions for further work in the area

Here are some articles that illustrate variations on this theme. There is no need to read the entire articles (unless the contents interest you); just quickly browse through to see the sections, and see how each section is introduced and what is contained in them.

The Determinants of Undergraduate Grade Point Average: The Relative Importance of Family Background, High School Resources, and Peer Group Effects , in The Journal of Human Resources , v. 34 no. 2 (Spring 1999), p. 268-293.

This article has a standard breakdown of sections:

  • Introduction
  • Literature Review
  • Some discussion sections

First Encounters of the Bureaucratic Kind: Early Freshman Experiences with a Campus Bureaucracy , in The Journal of Higher Education , v. 67 no. 6 (Nov-Dec 1996), p. 660-691.

This one does not have a section specifically labeled as a "literature review" or "review of the literature," but the first few sections cite a long list of other sources discussing previous research in the area before the authors present their own study they are reporting.

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Ten Simple Rules for Writing a Literature Review

Marco pautasso.

1 Centre for Functional and Evolutionary Ecology (CEFE), CNRS, Montpellier, France

2 Centre for Biodiversity Synthesis and Analysis (CESAB), FRB, Aix-en-Provence, France

Literature reviews are in great demand in most scientific fields. Their need stems from the ever-increasing output of scientific publications [1] . For example, compared to 1991, in 2008 three, eight, and forty times more papers were indexed in Web of Science on malaria, obesity, and biodiversity, respectively [2] . Given such mountains of papers, scientists cannot be expected to examine in detail every single new paper relevant to their interests [3] . Thus, it is both advantageous and necessary to rely on regular summaries of the recent literature. Although recognition for scientists mainly comes from primary research, timely literature reviews can lead to new synthetic insights and are often widely read [4] . For such summaries to be useful, however, they need to be compiled in a professional way [5] .

When starting from scratch, reviewing the literature can require a titanic amount of work. That is why researchers who have spent their career working on a certain research issue are in a perfect position to review that literature. Some graduate schools are now offering courses in reviewing the literature, given that most research students start their project by producing an overview of what has already been done on their research issue [6] . However, it is likely that most scientists have not thought in detail about how to approach and carry out a literature review.

Reviewing the literature requires the ability to juggle multiple tasks, from finding and evaluating relevant material to synthesising information from various sources, from critical thinking to paraphrasing, evaluating, and citation skills [7] . In this contribution, I share ten simple rules I learned working on about 25 literature reviews as a PhD and postdoctoral student. Ideas and insights also come from discussions with coauthors and colleagues, as well as feedback from reviewers and editors.

Rule 1: Define a Topic and Audience

How to choose which topic to review? There are so many issues in contemporary science that you could spend a lifetime of attending conferences and reading the literature just pondering what to review. On the one hand, if you take several years to choose, several other people may have had the same idea in the meantime. On the other hand, only a well-considered topic is likely to lead to a brilliant literature review [8] . The topic must at least be:

  • interesting to you (ideally, you should have come across a series of recent papers related to your line of work that call for a critical summary),
  • an important aspect of the field (so that many readers will be interested in the review and there will be enough material to write it), and
  • a well-defined issue (otherwise you could potentially include thousands of publications, which would make the review unhelpful).

Ideas for potential reviews may come from papers providing lists of key research questions to be answered [9] , but also from serendipitous moments during desultory reading and discussions. In addition to choosing your topic, you should also select a target audience. In many cases, the topic (e.g., web services in computational biology) will automatically define an audience (e.g., computational biologists), but that same topic may also be of interest to neighbouring fields (e.g., computer science, biology, etc.).

Rule 2: Search and Re-search the Literature

After having chosen your topic and audience, start by checking the literature and downloading relevant papers. Five pieces of advice here:

  • keep track of the search items you use (so that your search can be replicated [10] ),
  • keep a list of papers whose pdfs you cannot access immediately (so as to retrieve them later with alternative strategies),
  • use a paper management system (e.g., Mendeley, Papers, Qiqqa, Sente),
  • define early in the process some criteria for exclusion of irrelevant papers (these criteria can then be described in the review to help define its scope), and
  • do not just look for research papers in the area you wish to review, but also seek previous reviews.

The chances are high that someone will already have published a literature review ( Figure 1 ), if not exactly on the issue you are planning to tackle, at least on a related topic. If there are already a few or several reviews of the literature on your issue, my advice is not to give up, but to carry on with your own literature review,

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The bottom-right situation (many literature reviews but few research papers) is not just a theoretical situation; it applies, for example, to the study of the impacts of climate change on plant diseases, where there appear to be more literature reviews than research studies [33] .

  • discussing in your review the approaches, limitations, and conclusions of past reviews,
  • trying to find a new angle that has not been covered adequately in the previous reviews, and
  • incorporating new material that has inevitably accumulated since their appearance.

When searching the literature for pertinent papers and reviews, the usual rules apply:

  • be thorough,
  • use different keywords and database sources (e.g., DBLP, Google Scholar, ISI Proceedings, JSTOR Search, Medline, Scopus, Web of Science), and
  • look at who has cited past relevant papers and book chapters.

Rule 3: Take Notes While Reading

If you read the papers first, and only afterwards start writing the review, you will need a very good memory to remember who wrote what, and what your impressions and associations were while reading each single paper. My advice is, while reading, to start writing down interesting pieces of information, insights about how to organize the review, and thoughts on what to write. This way, by the time you have read the literature you selected, you will already have a rough draft of the review.

Of course, this draft will still need much rewriting, restructuring, and rethinking to obtain a text with a coherent argument [11] , but you will have avoided the danger posed by staring at a blank document. Be careful when taking notes to use quotation marks if you are provisionally copying verbatim from the literature. It is advisable then to reformulate such quotes with your own words in the final draft. It is important to be careful in noting the references already at this stage, so as to avoid misattributions. Using referencing software from the very beginning of your endeavour will save you time.

Rule 4: Choose the Type of Review You Wish to Write

After having taken notes while reading the literature, you will have a rough idea of the amount of material available for the review. This is probably a good time to decide whether to go for a mini- or a full review. Some journals are now favouring the publication of rather short reviews focusing on the last few years, with a limit on the number of words and citations. A mini-review is not necessarily a minor review: it may well attract more attention from busy readers, although it will inevitably simplify some issues and leave out some relevant material due to space limitations. A full review will have the advantage of more freedom to cover in detail the complexities of a particular scientific development, but may then be left in the pile of the very important papers “to be read” by readers with little time to spare for major monographs.

There is probably a continuum between mini- and full reviews. The same point applies to the dichotomy of descriptive vs. integrative reviews. While descriptive reviews focus on the methodology, findings, and interpretation of each reviewed study, integrative reviews attempt to find common ideas and concepts from the reviewed material [12] . A similar distinction exists between narrative and systematic reviews: while narrative reviews are qualitative, systematic reviews attempt to test a hypothesis based on the published evidence, which is gathered using a predefined protocol to reduce bias [13] , [14] . When systematic reviews analyse quantitative results in a quantitative way, they become meta-analyses. The choice between different review types will have to be made on a case-by-case basis, depending not just on the nature of the material found and the preferences of the target journal(s), but also on the time available to write the review and the number of coauthors [15] .

Rule 5: Keep the Review Focused, but Make It of Broad Interest

Whether your plan is to write a mini- or a full review, it is good advice to keep it focused 16 , 17 . Including material just for the sake of it can easily lead to reviews that are trying to do too many things at once. The need to keep a review focused can be problematic for interdisciplinary reviews, where the aim is to bridge the gap between fields [18] . If you are writing a review on, for example, how epidemiological approaches are used in modelling the spread of ideas, you may be inclined to include material from both parent fields, epidemiology and the study of cultural diffusion. This may be necessary to some extent, but in this case a focused review would only deal in detail with those studies at the interface between epidemiology and the spread of ideas.

While focus is an important feature of a successful review, this requirement has to be balanced with the need to make the review relevant to a broad audience. This square may be circled by discussing the wider implications of the reviewed topic for other disciplines.

Rule 6: Be Critical and Consistent

Reviewing the literature is not stamp collecting. A good review does not just summarize the literature, but discusses it critically, identifies methodological problems, and points out research gaps [19] . After having read a review of the literature, a reader should have a rough idea of:

  • the major achievements in the reviewed field,
  • the main areas of debate, and
  • the outstanding research questions.

It is challenging to achieve a successful review on all these fronts. A solution can be to involve a set of complementary coauthors: some people are excellent at mapping what has been achieved, some others are very good at identifying dark clouds on the horizon, and some have instead a knack at predicting where solutions are going to come from. If your journal club has exactly this sort of team, then you should definitely write a review of the literature! In addition to critical thinking, a literature review needs consistency, for example in the choice of passive vs. active voice and present vs. past tense.

Rule 7: Find a Logical Structure

Like a well-baked cake, a good review has a number of telling features: it is worth the reader's time, timely, systematic, well written, focused, and critical. It also needs a good structure. With reviews, the usual subdivision of research papers into introduction, methods, results, and discussion does not work or is rarely used. However, a general introduction of the context and, toward the end, a recapitulation of the main points covered and take-home messages make sense also in the case of reviews. For systematic reviews, there is a trend towards including information about how the literature was searched (database, keywords, time limits) [20] .

How can you organize the flow of the main body of the review so that the reader will be drawn into and guided through it? It is generally helpful to draw a conceptual scheme of the review, e.g., with mind-mapping techniques. Such diagrams can help recognize a logical way to order and link the various sections of a review [21] . This is the case not just at the writing stage, but also for readers if the diagram is included in the review as a figure. A careful selection of diagrams and figures relevant to the reviewed topic can be very helpful to structure the text too [22] .

Rule 8: Make Use of Feedback

Reviews of the literature are normally peer-reviewed in the same way as research papers, and rightly so [23] . As a rule, incorporating feedback from reviewers greatly helps improve a review draft. Having read the review with a fresh mind, reviewers may spot inaccuracies, inconsistencies, and ambiguities that had not been noticed by the writers due to rereading the typescript too many times. It is however advisable to reread the draft one more time before submission, as a last-minute correction of typos, leaps, and muddled sentences may enable the reviewers to focus on providing advice on the content rather than the form.

Feedback is vital to writing a good review, and should be sought from a variety of colleagues, so as to obtain a diversity of views on the draft. This may lead in some cases to conflicting views on the merits of the paper, and on how to improve it, but such a situation is better than the absence of feedback. A diversity of feedback perspectives on a literature review can help identify where the consensus view stands in the landscape of the current scientific understanding of an issue [24] .

Rule 9: Include Your Own Relevant Research, but Be Objective

In many cases, reviewers of the literature will have published studies relevant to the review they are writing. This could create a conflict of interest: how can reviewers report objectively on their own work [25] ? Some scientists may be overly enthusiastic about what they have published, and thus risk giving too much importance to their own findings in the review. However, bias could also occur in the other direction: some scientists may be unduly dismissive of their own achievements, so that they will tend to downplay their contribution (if any) to a field when reviewing it.

In general, a review of the literature should neither be a public relations brochure nor an exercise in competitive self-denial. If a reviewer is up to the job of producing a well-organized and methodical review, which flows well and provides a service to the readership, then it should be possible to be objective in reviewing one's own relevant findings. In reviews written by multiple authors, this may be achieved by assigning the review of the results of a coauthor to different coauthors.

Rule 10: Be Up-to-Date, but Do Not Forget Older Studies

Given the progressive acceleration in the publication of scientific papers, today's reviews of the literature need awareness not just of the overall direction and achievements of a field of inquiry, but also of the latest studies, so as not to become out-of-date before they have been published. Ideally, a literature review should not identify as a major research gap an issue that has just been addressed in a series of papers in press (the same applies, of course, to older, overlooked studies (“sleeping beauties” [26] )). This implies that literature reviewers would do well to keep an eye on electronic lists of papers in press, given that it can take months before these appear in scientific databases. Some reviews declare that they have scanned the literature up to a certain point in time, but given that peer review can be a rather lengthy process, a full search for newly appeared literature at the revision stage may be worthwhile. Assessing the contribution of papers that have just appeared is particularly challenging, because there is little perspective with which to gauge their significance and impact on further research and society.

Inevitably, new papers on the reviewed topic (including independently written literature reviews) will appear from all quarters after the review has been published, so that there may soon be the need for an updated review. But this is the nature of science [27] – [32] . I wish everybody good luck with writing a review of the literature.

Acknowledgments

Many thanks to M. Barbosa, K. Dehnen-Schmutz, T. Döring, D. Fontaneto, M. Garbelotto, O. Holdenrieder, M. Jeger, D. Lonsdale, A. MacLeod, P. Mills, M. Moslonka-Lefebvre, G. Stancanelli, P. Weisberg, and X. Xu for insights and discussions, and to P. Bourne, T. Matoni, and D. Smith for helpful comments on a previous draft.

Funding Statement

This work was funded by the French Foundation for Research on Biodiversity (FRB) through its Centre for Synthesis and Analysis of Biodiversity data (CESAB), as part of the NETSEED research project. The funders had no role in the preparation of the manuscript.

Conduct a literature review

What is a literature review.

A literature review is a summary of the published work in a field of study. This can be a section of a larger paper or article, or can be the focus of an entire paper. Literature reviews show that you have examined the breadth of knowledge and can justify your thesis or research questions. They are also valuable tools for other researchers who need to find a summary of that field of knowledge.

Unlike an annotated bibliography, which is a list of sources with short descriptions, a literature review synthesizes sources into a summary that has a thesis or statement of purpose—stated or implied—at its core.

How do I write a literature review?

Step 1: define your research scope.

  • What is the specific research question that your literature review helps to define?
  • Are there a maximum or minimum number of sources that your review should include?

Ask us if you have questions about refining your topic, search methods, writing tips, or citation management.

Step 2: Identify the literature

Start by searching broadly. Literature for your review will typically be acquired through scholarly books, journal articles, and/or dissertations. Develop an understanding of what is out there, what terms are accurate and helpful, etc., and keep track of all of it with citation management tools . If you need help figuring out key terms and where to search, ask us .

Use citation searching to track how scholars interact with, and build upon, previous research:

  • Mine the references cited section of each relevant source for additional key sources
  • Use Google Scholar or Scopus to find other sources that have cited a particular work

Step 3: Critically analyze the literature

Key to your literature review is a critical analysis of the literature collected around your topic. The analysis will explore relationships, major themes, and any critical gaps in the research expressed in the work. Read and summarize each source with an eye toward analyzing authority, currency, coverage, methodology, and relationship to other works. The University of Toronto's Writing Center provides a comprehensive list of questions you can use to analyze your sources.

Step 4: Categorize your resources

Divide the available resources that pertain to your research into categories reflecting their roles in addressing your research question. Possible ways to categorize resources include organization by:

  • methodology
  • theoretical/philosophical approach

Regardless of the division, each category should be accompanied by thorough discussions and explanations of strengths and weaknesses, value to the overall survey, and comparisons with similar sources. You may have enough resources when:

  • You've used multiple databases and other resources (web portals, repositories, etc.) to get a variety of perspectives on the research topic.
  • The same citations are showing up in a variety of databases.

Additional resources

Undergraduate student resources.

  • Literature Review Handout (University of North Carolina at Chapel Hill)
  • Learn how to write a review of literature (University of Wisconsin-Madison)

Graduate student and faculty resources

  • Information Research Strategies (University of Arizona)
  • Literature Reviews: An Overview for Graduate Students (NC State University)
  • Oliver, P. (2012). Succeeding with Your Literature Review: A Handbook for Students [ebook]
  • Machi, L. A. & McEvoy, B. T. (2016). The Literature Review: Six Steps to Success

Graustein, J. S. (2012). How to Write an Exceptional Thesis or Dissertation: A Step-by-Step Guide from Proposal to Successful Defense [ebook]

Thomas, R. M. & Brubaker, D. L. (2008). Theses and Dissertations: A Guide to Planning, Research, and Writing

University of Texas

  • University of Texas Libraries

Literature Reviews

  • What is a literature review?
  • Steps in the Literature Review Process
  • Define your research question
  • Determine inclusion and exclusion criteria
  • Choose databases and search
  • Review Results
  • Synthesize Results
  • Analyze Results
  • Librarian Support

What is a Literature Review?

A literature or narrative review is a comprehensive review and analysis of the published literature on a specific topic or research question. The literature that is reviewed contains: books, articles, academic articles, conference proceedings, association papers, and dissertations. It contains the most pertinent studies and points to important past and current research and practices. It provides background and context, and shows how your research will contribute to the field. 

A literature review should: 

  • Provide a comprehensive and updated review of the literature;
  • Explain why this review has taken place;
  • Articulate a position or hypothesis;
  • Acknowledge and account for conflicting and corroborating points of view

From  S age Research Methods

Purpose of a Literature Review

A literature review can be written as an introduction to a study to:

  • Demonstrate how a study fills a gap in research
  • Compare a study with other research that's been done

Or it can be a separate work (a research article on its own) which:

  • Organizes or describes a topic
  • Describes variables within a particular issue/problem

Limitations of a Literature Review

Some of the limitations of a literature review are:

  • It's a snapshot in time. Unlike other reviews, this one has beginning, a middle and an end. There may be future developments that could make your work less relevant.
  • It may be too focused. Some niche studies may miss the bigger picture.
  • It can be difficult to be comprehensive. There is no way to make sure all the literature on a topic was considered.
  • It is easy to be biased if you stick to top tier journals. There may be other places where people are publishing exemplary research. Look to open access publications and conferences to reflect a more inclusive collection. Also, make sure to include opposing views (and not just supporting evidence).

Source: Grant, Maria J., and Andrew Booth. “A Typology of Reviews: An Analysis of 14 Review Types and Associated Methodologies.” Health Information & Libraries Journal, vol. 26, no. 2, June 2009, pp. 91–108. Wiley Online Library, doi:10.1111/j.1471-1842.2009.00848.x.

Meryl Brodsky : Communication and Information Studies

Hannah Chapman Tripp : Biology, Neuroscience

Carolyn Cunningham : Human Development & Family Sciences, Psychology, Sociology

Larayne Dallas : Engineering

Janelle Hedstrom : Special Education, Curriculum & Instruction, Ed Leadership & Policy ​

Susan Macicak : Linguistics

Imelda Vetter : Dell Medical School

For help in other subject areas, please see the guide to library specialists by subject .

Periodically, UT Libraries runs a workshop covering the basics and library support for literature reviews. While we try to offer these once per academic year, we find providing the recording to be helpful to community members who have missed the session. Following is the most recent recording of the workshop, Conducting a Literature Review. To view the recording, a UT login is required.

  • October 26, 2022 recording
  • Last Updated: Oct 26, 2022 2:49 PM
  • URL: https://guides.lib.utexas.edu/literaturereviews

Creative Commons License

Grad Coach

How To Write An A-Grade Literature Review

3 straightforward steps (with examples) + free template.

By: Derek Jansen (MBA) | Expert Reviewed By: Dr. Eunice Rautenbach | October 2019

Quality research is about building onto the existing work of others , “standing on the shoulders of giants”, as Newton put it. The literature review chapter of your dissertation, thesis or research project is where you synthesise this prior work and lay the theoretical foundation for your own research.

Long story short, this chapter is a pretty big deal, which is why you want to make sure you get it right . In this post, I’ll show you exactly how to write a literature review in three straightforward steps, so you can conquer this vital chapter (the smart way).

Overview: The Literature Review Process

  • Understanding the “ why “
  • Finding the relevant literature
  • Cataloguing and synthesising the information
  • Outlining & writing up your literature review
  • Example of a literature review

But first, the “why”…

Before we unpack how to write the literature review chapter, we’ve got to look at the why . To put it bluntly, if you don’t understand the function and purpose of the literature review process, there’s no way you can pull it off well. So, what exactly is the purpose of the literature review?

Well, there are (at least) four core functions:

  • For you to gain an understanding (and demonstrate this understanding) of where the research is at currently, what the key arguments and disagreements are.
  • For you to identify the gap(s) in the literature and then use this as justification for your own research topic.
  • To help you build a conceptual framework for empirical testing (if applicable to your research topic).
  • To inform your methodological choices and help you source tried and tested questionnaires (for interviews ) and measurement instruments (for surveys ).

Most students understand the first point but don’t give any thought to the rest. To get the most from the literature review process, you must keep all four points front of mind as you review the literature (more on this shortly), or you’ll land up with a wonky foundation.

Okay – with the why out the way, let’s move on to the how . As mentioned above, writing your literature review is a process, which I’ll break down into three steps:

  • Finding the most suitable literature
  • Understanding , distilling and organising the literature
  • Planning and writing up your literature review chapter

Importantly, you must complete steps one and two before you start writing up your chapter. I know it’s very tempting, but don’t try to kill two birds with one stone and write as you read. You’ll invariably end up wasting huge amounts of time re-writing and re-shaping, or you’ll just land up with a disjointed, hard-to-digest mess . Instead, you need to read first and distil the information, then plan and execute the writing.

Free Webinar: Literature Review 101

Step 1: Find the relevant literature

Naturally, the first step in the literature review journey is to hunt down the existing research that’s relevant to your topic. While you probably already have a decent base of this from your research proposal , you need to expand on this substantially in the dissertation or thesis itself.

Essentially, you need to be looking for any existing literature that potentially helps you answer your research question (or develop it, if that’s not yet pinned down). There are numerous ways to find relevant literature, but I’ll cover my top four tactics here. I’d suggest combining all four methods to ensure that nothing slips past you:

Method 1 – Google Scholar Scrubbing

Google’s academic search engine, Google Scholar , is a great starting point as it provides a good high-level view of the relevant journal articles for whatever keyword you throw at it. Most valuably, it tells you how many times each article has been cited, which gives you an idea of how credible (or at least, popular) it is. Some articles will be free to access, while others will require an account, which brings us to the next method.

Method 2 – University Database Scrounging

Generally, universities provide students with access to an online library, which provides access to many (but not all) of the major journals.

So, if you find an article using Google Scholar that requires paid access (which is quite likely), search for that article in your university’s database – if it’s listed there, you’ll have access. Note that, generally, the search engine capabilities of these databases are poor, so make sure you search for the exact article name, or you might not find it.

Method 3 – Journal Article Snowballing

At the end of every academic journal article, you’ll find a list of references. As with any academic writing, these references are the building blocks of the article, so if the article is relevant to your topic, there’s a good chance a portion of the referenced works will be too. Do a quick scan of the titles and see what seems relevant, then search for the relevant ones in your university’s database.

Method 4 – Dissertation Scavenging

Similar to Method 3 above, you can leverage other students’ dissertations. All you have to do is skim through literature review chapters of existing dissertations related to your topic and you’ll find a gold mine of potential literature. Usually, your university will provide you with access to previous students’ dissertations, but you can also find a much larger selection in the following databases:

  • Open Access Theses & Dissertations
  • Stanford SearchWorks

Keep in mind that dissertations and theses are not as academically sound as published, peer-reviewed journal articles (because they’re written by students, not professionals), so be sure to check the credibility of any sources you find using this method. You can do this by assessing the citation count of any given article in Google Scholar. If you need help with assessing the credibility of any article, or with finding relevant research in general, you can chat with one of our Research Specialists .

Alright – with a good base of literature firmly under your belt, it’s time to move onto the next step.

Need a helping hand?

review of literature of a research report

Step 2: Log, catalogue and synthesise

Once you’ve built a little treasure trove of articles, it’s time to get reading and start digesting the information – what does it all mean?

While I present steps one and two (hunting and digesting) as sequential, in reality, it’s more of a back-and-forth tango – you’ll read a little , then have an idea, spot a new citation, or a new potential variable, and then go back to searching for articles. This is perfectly natural – through the reading process, your thoughts will develop , new avenues might crop up, and directional adjustments might arise. This is, after all, one of the main purposes of the literature review process (i.e. to familiarise yourself with the current state of research in your field).

As you’re working through your treasure chest, it’s essential that you simultaneously start organising the information. There are three aspects to this:

  • Logging reference information
  • Building an organised catalogue
  • Distilling and synthesising the information

I’ll discuss each of these below:

2.1 – Log the reference information

As you read each article, you should add it to your reference management software. I usually recommend Mendeley for this purpose (see the Mendeley 101 video below), but you can use whichever software you’re comfortable with. Most importantly, make sure you load EVERY article you read into your reference manager, even if it doesn’t seem very relevant at the time.

2.2 – Build an organised catalogue

In the beginning, you might feel confident that you can remember who said what, where, and what their main arguments were. Trust me, you won’t. If you do a thorough review of the relevant literature (as you must!), you’re going to read many, many articles, and it’s simply impossible to remember who said what, when, and in what context . Also, without the bird’s eye view that a catalogue provides, you’ll miss connections between various articles, and have no view of how the research developed over time. Simply put, it’s essential to build your own catalogue of the literature.

I would suggest using Excel to build your catalogue, as it allows you to run filters, colour code and sort – all very useful when your list grows large (which it will). How you lay your spreadsheet out is up to you, but I’d suggest you have the following columns (at minimum):

  • Author, date, title – Start with three columns containing this core information. This will make it easy for you to search for titles with certain words, order research by date, or group by author.
  • Categories or keywords – You can either create multiple columns, one for each category/theme and then tick the relevant categories, or you can have one column with keywords.
  • Key arguments/points – Use this column to succinctly convey the essence of the article, the key arguments and implications thereof for your research.
  • Context – Note the socioeconomic context in which the research was undertaken. For example, US-based, respondents aged 25-35, lower- income, etc. This will be useful for making an argument about gaps in the research.
  • Methodology – Note which methodology was used and why. Also, note any issues you feel arise due to the methodology. Again, you can use this to make an argument about gaps in the research.
  • Quotations – Note down any quoteworthy lines you feel might be useful later.
  • Notes – Make notes about anything not already covered. For example, linkages to or disagreements with other theories, questions raised but unanswered, shortcomings or limitations, and so forth.

If you’d like, you can try out our free catalog template here (see screenshot below).

Excel literature review template

2.3 – Digest and synthesise

Most importantly, as you work through the literature and build your catalogue, you need to synthesise all the information in your own mind – how does it all fit together? Look for links between the various articles and try to develop a bigger picture view of the state of the research. Some important questions to ask yourself are:

  • What answers does the existing research provide to my own research questions ?
  • Which points do the researchers agree (and disagree) on?
  • How has the research developed over time?
  • Where do the gaps in the current research lie?

To help you develop a big-picture view and synthesise all the information, you might find mind mapping software such as Freemind useful. Alternatively, if you’re a fan of physical note-taking, investing in a large whiteboard might work for you.

Mind mapping is a useful way to plan your literature review.

Step 3: Outline and write it up!

Once you’re satisfied that you have digested and distilled all the relevant literature in your mind, it’s time to put pen to paper (or rather, fingers to keyboard). There are two steps here – outlining and writing:

3.1 – Draw up your outline

Having spent so much time reading, it might be tempting to just start writing up without a clear structure in mind. However, it’s critically important to decide on your structure and develop a detailed outline before you write anything. Your literature review chapter needs to present a clear, logical and an easy to follow narrative – and that requires some planning. Don’t try to wing it!

Naturally, you won’t always follow the plan to the letter, but without a detailed outline, you’re more than likely going to end up with a disjointed pile of waffle , and then you’re going to spend a far greater amount of time re-writing, hacking and patching. The adage, “measure twice, cut once” is very suitable here.

In terms of structure, the first decision you’ll have to make is whether you’ll lay out your review thematically (into themes) or chronologically (by date/period). The right choice depends on your topic, research objectives and research questions, which we discuss in this article .

Once that’s decided, you need to draw up an outline of your entire chapter in bullet point format. Try to get as detailed as possible, so that you know exactly what you’ll cover where, how each section will connect to the next, and how your entire argument will develop throughout the chapter. Also, at this stage, it’s a good idea to allocate rough word count limits for each section, so that you can identify word count problems before you’ve spent weeks or months writing!

PS – check out our free literature review chapter template…

3.2 – Get writing

With a detailed outline at your side, it’s time to start writing up (finally!). At this stage, it’s common to feel a bit of writer’s block and find yourself procrastinating under the pressure of finally having to put something on paper. To help with this, remember that the objective of the first draft is not perfection – it’s simply to get your thoughts out of your head and onto paper, after which you can refine them. The structure might change a little, the word count allocations might shift and shuffle, and you might add or remove a section – that’s all okay. Don’t worry about all this on your first draft – just get your thoughts down on paper.

start writing

Once you’ve got a full first draft (however rough it may be), step away from it for a day or two (longer if you can) and then come back at it with fresh eyes. Pay particular attention to the flow and narrative – does it fall fit together and flow from one section to another smoothly? Now’s the time to try to improve the linkage from each section to the next, tighten up the writing to be more concise, trim down word count and sand it down into a more digestible read.

Once you’ve done that, give your writing to a friend or colleague who is not a subject matter expert and ask them if they understand the overall discussion. The best way to assess this is to ask them to explain the chapter back to you. This technique will give you a strong indication of which points were clearly communicated and which weren’t. If you’re working with Grad Coach, this is a good time to have your Research Specialist review your chapter.

Finally, tighten it up and send it off to your supervisor for comment. Some might argue that you should be sending your work to your supervisor sooner than this (indeed your university might formally require this), but in my experience, supervisors are extremely short on time (and often patience), so, the more refined your chapter is, the less time they’ll waste on addressing basic issues (which you know about already) and the more time they’ll spend on valuable feedback that will increase your mark-earning potential.

Literature Review Example

In the video below, we unpack an actual literature review so that you can see how all the core components come together in reality.

Let’s Recap

In this post, we’ve covered how to research and write up a high-quality literature review chapter. Let’s do a quick recap of the key takeaways:

  • It is essential to understand the WHY of the literature review before you read or write anything. Make sure you understand the 4 core functions of the process.
  • The first step is to hunt down the relevant literature . You can do this using Google Scholar, your university database, the snowballing technique and by reviewing other dissertations and theses.
  • Next, you need to log all the articles in your reference manager , build your own catalogue of literature and synthesise all the research.
  • Following that, you need to develop a detailed outline of your entire chapter – the more detail the better. Don’t start writing without a clear outline (on paper, not in your head!)
  • Write up your first draft in rough form – don’t aim for perfection. Remember, done beats perfect.
  • Refine your second draft and get a layman’s perspective on it . Then tighten it up and submit it to your supervisor.

Literature Review Course

Psst… there’s more!

This post is an extract from our bestselling Udemy Course, Literature Review Bootcamp . If you want to work smart, you don't want to miss this .

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37 Comments

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You’re welcome, Yinka. Thank you for the kind words. All the best writing your literature review.

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Mthuthuzeli Vongo

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Literature review

A general guide on how to conduct and write a literature review.

Please check course or programme information and materials provided by teaching staff , including your project supervisor, for subject-specific guidance.

What is a literature review?

A literature review is a piece of academic writing demonstrating knowledge and understanding of the academic literature on a specific topic placed in context.  A literature review also includes a critical evaluation of the material; this is why it is called a literature review rather than a literature report. It is a process of reviewing the literature, as well as a form of writing.

To illustrate the difference between reporting and reviewing, think about television or film review articles.  These articles include content such as a brief synopsis or the key points of the film or programme plus the critic’s own evaluation.  Similarly the two main objectives of a literature review are firstly the content covering existing research, theories and evidence, and secondly your own critical evaluation and discussion of this content. 

Usually a literature review forms a section or part of a dissertation, research project or long essay.  However, it can also be set and assessed as a standalone piece of work.

What is the purpose of a literature review?

…your task is to build an argument, not a library. Rudestam, K.E. and Newton, R.R. (1992) Surviving your dissertation: A comprehensive guide to content and process. California: Sage, p49.

In a larger piece of written work, such as a dissertation or project, a literature review is usually one of the first tasks carried out after deciding on a topic.  Reading combined with critical analysis can help to refine a topic and frame research questions.  Conducting a literature review establishes your familiarity with and understanding of current research in a particular field before carrying out a new investigation.  After doing a literature review, you should know what research has already been done and be able to identify what is unknown within your topic.

When doing and writing a literature review, it is good practice to:

  • summarise and analyse previous research and theories;
  • identify areas of controversy and contested claims;
  • highlight any gaps that may exist in research to date.

Conducting a literature review

Focusing on different aspects of your literature review can be useful to help plan, develop, refine and write it.  You can use and adapt the prompt questions in our worksheet below at different points in the process of researching and writing your review.  These are suggestions to get you thinking and writing.

Developing and refining your literature review (pdf)

Developing and refining your literature review (Word)

Developing and refining your literature review (Word rtf)

Writing a literature review has a lot in common with other assignment tasks.  There is advice on our other pages about thinking critically, reading strategies and academic writing.  Our literature review top tips suggest some specific things you can do to help you submit a successful review.

Literature review top tips (pdf)

Literature review top tips (Word rtf)

Our reading page includes strategies and advice on using books and articles and a notes record sheet grid you can use.

Reading at university

The Academic writing page suggests ways to organise and structure information from a range of sources and how you can develop your argument as you read and write.

Academic writing

The Critical thinking page has advice on how to be a more critical researcher and a form you can use to help you think and break down the stages of developing your argument.

Critical thinking

As with other forms of academic writing, your literature review needs to demonstrate good academic practice by following the Code of Student Conduct and acknowledging the work of others through citing and referencing your sources.  

Good academic practice

As with any writing task, you will need to review, edit and rewrite sections of your literature review.  The Editing and proofreading page includes tips on how to do this and strategies for standing back and thinking about your structure and checking the flow of your argument.

Editing and proofreading

Guidance on literature searching from the University Library

The Academic Support Librarians have developed LibSmart I and II, Learn courses to help you develop and enhance your digital research skills and capabilities; from getting started with the Library to managing data for your dissertation.

Searching using the library’s DiscoverEd tool: DiscoverEd

Finding resources in your subject: Subject guides

The Academic Support Librarians also provide one-to-one appointments to help you develop your research strategies.

1 to 1 support for literature searching and systematic reviews

Advice to help you optimise use of Google Scholar, Google Books and Google for your research and study: Using Google

Managing and curating your references

A referencing management tool can help you to collect and organise and your source material to produce a bibliography or reference list. 

Referencing and reference management

Information Services provide access to Cite them right online which is a guide to the main referencing systems and tells you how to reference just about any source (EASE log-in may be required).

Cite them right

Published study guides

There are a number of scholarship skills books and guides available which can help with writing a literature review.  Our Resource List of study skills guides includes sections on Referencing, Dissertation and project writing and Literature reviews.

Study skills guides

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How to Make a Literature Review in Research (RRL Example)

review of literature of a research report

What is an RRL in a research paper?

A relevant review of the literature (RRL) is an objective, concise, critical summary of published research literature relevant to a topic being researched in an article. In an RRL, you discuss knowledge and findings from existing literature relevant to your study topic. If there are conflicts or gaps in existing literature, you can also discuss these in your review, as well as how you will confront these missing elements or resolve these issues in your study.

To complete an RRL, you first need to collect relevant literature; this can include online and offline sources. Save all of your applicable resources as you will need to include them in your paper. When looking through these sources, take notes and identify concepts of each source to describe in the review of the literature.

A good RRL does NOT:

A literature review does not simply reference and list all of the material you have cited in your paper.

  • Presenting material that is not directly relevant to your study will distract and frustrate the reader and make them lose sight of the purpose of your study.
  • Starting a literature review with “A number of scholars have studied the relationship between X and Y” and simply listing who has studied the topic and what each scholar concluded is not going to strengthen your paper.

A good RRL DOES:

  • Present a brief typology that orders articles and books into groups to help readers focus on unresolved debates, inconsistencies, tensions, and new questions about a research topic.
  • Summarize the most relevant and important aspects of the scientific literature related to your area of research
  • Synthesize what has been done in this area of research and by whom, highlight what previous research indicates about a topic, and identify potential gaps and areas of disagreement in the field
  • Give the reader an understanding of the background of the field and show which studies are important—and highlight errors in previous studies

How long is a review of the literature for a research paper?

The length of a review of the literature depends on its purpose and target readership and can vary significantly in scope and depth. In a dissertation, thesis, or standalone review of literature, it is usually a full chapter of the text (at least 20 pages). Whereas, a standard research article or school assignment literature review section could only be a few paragraphs in the Introduction section .

Building Your Literature Review Bookshelf

One way to conceive of a literature review is to think about writing it as you would build a bookshelf. You don’t need to cut each piece by yourself from scratch. Rather, you can take the pieces that other researchers have cut out and put them together to build a framework on which to hang your own “books”—that is, your own study methods, results, and conclusions.

literature review bookshelf

What Makes a Good Literature Review?

The contents of a literature review (RRL) are determined by many factors, including its precise purpose in the article, the degree of consensus with a given theory or tension between competing theories, the length of the article, the number of previous studies existing in the given field, etc. The following are some of the most important elements that a literature review provides.

Historical background for your research

Analyze what has been written about your field of research to highlight what is new and significant in your study—or how the analysis itself contributes to the understanding of this field, even in a small way. Providing a historical background also demonstrates to other researchers and journal editors your competency in discussing theoretical concepts. You should also make sure to understand how to paraphrase scientific literature to avoid plagiarism in your work.

The current context of your research

Discuss central (or peripheral) questions, issues, and debates in the field. Because a field is constantly being updated by new work, you can show where your research fits into this context and explain developments and trends in research.

A discussion of relevant theories and concepts

Theories and concepts should provide the foundation for your research. For example, if you are researching the relationship between ecological environments and human populations, provide models and theories that focus on specific aspects of this connection to contextualize your study. If your study asks a question concerning sustainability, mention a theory or model that underpins this concept. If it concerns invasive species, choose material that is focused in this direction.

Definitions of relevant terminology

In the natural sciences, the meaning of terms is relatively straightforward and consistent. But if you present a term that is obscure or context-specific, you should define the meaning of the term in the Introduction section (if you are introducing a study) or in the summary of the literature being reviewed.

Description of related relevant research

Include a description of related research that shows how your work expands or challenges earlier studies or fills in gaps in previous work. You can use your literature review as evidence of what works, what doesn’t, and what is missing in the field.

Supporting evidence for a practical problem or issue your research is addressing that demonstrates its importance: Referencing related research establishes your area of research as reputable and shows you are building upon previous work that other researchers have deemed significant.

Types of Literature Reviews

Literature reviews can differ in structure, length, amount, and breadth of content included. They can range from selective (a very narrow area of research or only a single work) to comprehensive (a larger amount or range of works). They can also be part of a larger work or stand on their own.

types of literature reviews

  • A course assignment is an example of a selective, stand-alone work. It focuses on a small segment of the literature on a topic and makes up an entire work on its own.
  • The literature review in a dissertation or thesis is both comprehensive and helps make up a larger work.
  • A majority of journal articles start with a selective literature review to provide context for the research reported in the study; such a literature review is usually included in the Introduction section (but it can also follow the presentation of the results in the Discussion section ).
  • Some literature reviews are both comprehensive and stand as a separate work—in this case, the entire article analyzes the literature on a given topic.

Literature Reviews Found in Academic Journals

The two types of literature reviews commonly found in journals are those introducing research articles (studies and surveys) and stand-alone literature analyses. They can differ in their scope, length, and specific purpose.

Literature reviews introducing research articles

The literature review found at the beginning of a journal article is used to introduce research related to the specific study and is found in the Introduction section, usually near the end. It is shorter than a stand-alone review because it must be limited to very specific studies and theories that are directly relevant to the current study. Its purpose is to set research precedence and provide support for the study’s theory, methods, results, and/or conclusions. Not all research articles contain an explicit review of the literature, but most do, whether it is a discrete section or indistinguishable from the rest of the Introduction.

How to structure a literature review for an article

When writing a literature review as part of an introduction to a study, simply follow the structure of the Introduction and move from the general to the specific—presenting the broadest background information about a topic first and then moving to specific studies that support your rationale , finally leading to your hypothesis statement. Such a literature review is often indistinguishable from the Introduction itself—the literature is INTRODUCING the background and defining the gaps your study aims to fill.

The stand-alone literature review

The literature review published as a stand-alone article presents and analyzes as many of the important publications in an area of study as possible to provide background information and context for a current area of research or a study. Stand-alone reviews are an excellent resource for researchers when they are first searching for the most relevant information on an area of study.

Such literature reviews are generally a bit broader in scope and can extend further back in time. This means that sometimes a scientific literature review can be highly theoretical, in addition to focusing on specific methods and outcomes of previous studies. In addition, all sections of such a “review article” refer to existing literature rather than describing the results of the authors’ own study.

In addition, this type of literature review is usually much longer than the literature review introducing a study. At the end of the review follows a conclusion that once again explicitly ties all of the cited works together to show how this analysis is itself a contribution to the literature. While not absolutely necessary, such articles often include the terms “Literature Review” or “Review of the Literature” in the title. Whether or not that is necessary or appropriate can also depend on the specific author instructions of the target journal. Have a look at this article for more input on how to compile a stand-alone review article that is insightful and helpful for other researchers in your field.

literature review examples

How to Write a Literature Review in 6 Steps

So how do authors turn a network of articles into a coherent review of relevant literature?

Writing a literature review is not usually a linear process—authors often go back and check the literature while reformulating their ideas or making adjustments to their study. Sometimes new findings are published before a study is completed and need to be incorporated into the current work. This also means you will not be writing the literature review at any one time, but constantly working on it before, during, and after your study is complete.

Here are some steps that will help you begin and follow through on your literature review.

Step 1: Choose a topic to write about—focus on and explore this topic.

Choose a topic that you are familiar with and highly interested in analyzing; a topic your intended readers and researchers will find interesting and useful; and a topic that is current, well-established in the field, and about which there has been sufficient research conducted for a review. This will help you find the “sweet spot” for what to focus on.

Step 2: Research and collect all the scholarly information on the topic that might be pertinent to your study.

This includes scholarly articles, books, conventions, conferences, dissertations, and theses—these and any other academic work related to your area of study is called “the literature.”

Step 3: Analyze the network of information that extends or responds to the major works in your area; select the material that is most useful.

Use thought maps and charts to identify intersections in the research and to outline important categories; select the material that will be most useful to your review.

Step 4: Describe and summarize each article—provide the essential information of the article that pertains to your study.

Determine 2-3 important concepts (depending on the length of your article) that are discussed in the literature; take notes about all of the important aspects of this study relevant to the topic being reviewed.

For example, in a given study, perhaps some of the main concepts are X, Y, and Z. Note these concepts and then write a brief summary about how the article incorporates them. In reviews that introduce a study, these can be relatively short. In stand-alone reviews, there may be significantly more texts and more concepts.

Step 5: Demonstrate how these concepts in the literature relate to what you discovered in your study or how the literature connects the concepts or topics being discussed.

In a literature review intro for an article, this information might include a summary of the results or methods of previous studies that correspond to and/or confirm those sections in your own study. For a stand-alone literature review, this may mean highlighting the concepts in each article and showing how they strengthen a hypothesis or show a pattern.

Discuss unaddressed issues in previous studies. These studies that are missing something you address are important to include in your literature review. In addition, those works whose theories and conclusions directly support your findings will be valuable to review here.

Step 6: Identify relationships in the literature and develop and connect your own ideas to them.

This is essentially the same as step 5 but focused on the connections between the literature and the current study or guiding concepts or arguments of the paper, not only on the connections between the works themselves.

Your hypothesis, argument, or guiding concept is the “golden thread” that will ultimately tie the works together and provide readers with specific insights they didn’t have before reading your literature review. Make sure you know where to put the research question , hypothesis, or statement of the problem in your research paper so that you guide your readers logically and naturally from your introduction of earlier work and evidence to the conclusions you want them to draw from the bigger picture.

Your literature review will not only cover publications on your topics but will include your own ideas and contributions. By following these steps you will be telling the specific story that sets the background and shows the significance of your research and you can turn a network of related works into a focused review of the literature.

Literature Review (RRL) Examples

Because creating sample literature reviews would take too long and not properly capture the nuances and detailed information needed for a good review, we have included some links to different types of literature reviews below. You can find links to more literature reviews in these categories by visiting the TUS Library’s website . Sample literature reviews as part of an article, dissertation, or thesis:

  • Critical Thinking and Transferability: A Review of the Literature (Gwendolyn Reece)
  • Building Customer Loyalty: A Customer Experience Based Approach in a Tourism Context (Martina Donnelly)

Sample stand-alone literature reviews

  • Literature Review on Attitudes towards Disability (National Disability Authority)
  • The Effects of Communication Styles on Marital Satisfaction (Hannah Yager)

Additional Literature Review Format Guidelines

In addition to the content guidelines above, authors also need to check which style guidelines to use ( APA , Chicago, MLA, etc.) and what specific rules the target journal might have for how to structure such articles or how many studies to include—such information can usually be found on the journals’ “Guide for Authors” pages. Additionally, use one of the four Wordvice citation generators below, choosing the citation style needed for your paper:

Wordvice Writing and Academic Editing Resources

Finally, after you have finished drafting your literature review, be sure to receive professional proofreading services , including paper editing for your academic work. A competent proofreader who understands academic writing conventions and the specific style guides used by academic journals will ensure that your paper is ready for publication in your target journal.

See our academic resources for further advice on references in your paper , how to write an abstract , how to write a research paper title, how to impress the editor of your target journal with a perfect cover letter , and dozens of other research writing and publication topics.

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Home » Literature Review – Types Writing Guide and Examples

Literature Review – Types Writing Guide and Examples

Table of Contents

Literature Review

Literature Review

Definition:

A literature review is a comprehensive and critical analysis of the existing literature on a particular topic or research question. It involves identifying, evaluating, and synthesizing relevant literature, including scholarly articles, books, and other sources, to provide a summary and critical assessment of what is known about the topic.

Types of Literature Review

Types of Literature Review are as follows:

  • Narrative literature review : This type of review involves a comprehensive summary and critical analysis of the available literature on a particular topic or research question. It is often used as an introductory section of a research paper.
  • Systematic literature review: This is a rigorous and structured review that follows a pre-defined protocol to identify, evaluate, and synthesize all relevant studies on a specific research question. It is often used in evidence-based practice and systematic reviews.
  • Meta-analysis: This is a quantitative review that uses statistical methods to combine data from multiple studies to derive a summary effect size. It provides a more precise estimate of the overall effect than any individual study.
  • Scoping review: This is a preliminary review that aims to map the existing literature on a broad topic area to identify research gaps and areas for further investigation.
  • Critical literature review : This type of review evaluates the strengths and weaknesses of the existing literature on a particular topic or research question. It aims to provide a critical analysis of the literature and identify areas where further research is needed.
  • Conceptual literature review: This review synthesizes and integrates theories and concepts from multiple sources to provide a new perspective on a particular topic. It aims to provide a theoretical framework for understanding a particular research question.
  • Rapid literature review: This is a quick review that provides a snapshot of the current state of knowledge on a specific research question or topic. It is often used when time and resources are limited.
  • Thematic literature review : This review identifies and analyzes common themes and patterns across a body of literature on a particular topic. It aims to provide a comprehensive overview of the literature and identify key themes and concepts.
  • Realist literature review: This review is often used in social science research and aims to identify how and why certain interventions work in certain contexts. It takes into account the context and complexities of real-world situations.
  • State-of-the-art literature review : This type of review provides an overview of the current state of knowledge in a particular field, highlighting the most recent and relevant research. It is often used in fields where knowledge is rapidly evolving, such as technology or medicine.
  • Integrative literature review: This type of review synthesizes and integrates findings from multiple studies on a particular topic to identify patterns, themes, and gaps in the literature. It aims to provide a comprehensive understanding of the current state of knowledge on a particular topic.
  • Umbrella literature review : This review is used to provide a broad overview of a large and diverse body of literature on a particular topic. It aims to identify common themes and patterns across different areas of research.
  • Historical literature review: This type of review examines the historical development of research on a particular topic or research question. It aims to provide a historical context for understanding the current state of knowledge on a particular topic.
  • Problem-oriented literature review : This review focuses on a specific problem or issue and examines the literature to identify potential solutions or interventions. It aims to provide practical recommendations for addressing a particular problem or issue.
  • Mixed-methods literature review : This type of review combines quantitative and qualitative methods to synthesize and analyze the available literature on a particular topic. It aims to provide a more comprehensive understanding of the research question by combining different types of evidence.

Parts of Literature Review

Parts of a literature review are as follows:

Introduction

The introduction of a literature review typically provides background information on the research topic and why it is important. It outlines the objectives of the review, the research question or hypothesis, and the scope of the review.

Literature Search

This section outlines the search strategy and databases used to identify relevant literature. The search terms used, inclusion and exclusion criteria, and any limitations of the search are described.

Literature Analysis

The literature analysis is the main body of the literature review. This section summarizes and synthesizes the literature that is relevant to the research question or hypothesis. The review should be organized thematically, chronologically, or by methodology, depending on the research objectives.

Critical Evaluation

Critical evaluation involves assessing the quality and validity of the literature. This includes evaluating the reliability and validity of the studies reviewed, the methodology used, and the strength of the evidence.

The conclusion of the literature review should summarize the main findings, identify any gaps in the literature, and suggest areas for future research. It should also reiterate the importance of the research question or hypothesis and the contribution of the literature review to the overall research project.

The references list includes all the sources cited in the literature review, and follows a specific referencing style (e.g., APA, MLA, Harvard).

How to write Literature Review

Here are some steps to follow when writing a literature review:

  • Define your research question or topic : Before starting your literature review, it is essential to define your research question or topic. This will help you identify relevant literature and determine the scope of your review.
  • Conduct a comprehensive search: Use databases and search engines to find relevant literature. Look for peer-reviewed articles, books, and other academic sources that are relevant to your research question or topic.
  • Evaluate the sources: Once you have found potential sources, evaluate them critically to determine their relevance, credibility, and quality. Look for recent publications, reputable authors, and reliable sources of data and evidence.
  • Organize your sources: Group the sources by theme, method, or research question. This will help you identify similarities and differences among the literature, and provide a structure for your literature review.
  • Analyze and synthesize the literature : Analyze each source in depth, identifying the key findings, methodologies, and conclusions. Then, synthesize the information from the sources, identifying patterns and themes in the literature.
  • Write the literature review : Start with an introduction that provides an overview of the topic and the purpose of the literature review. Then, organize the literature according to your chosen structure, and analyze and synthesize the sources. Finally, provide a conclusion that summarizes the key findings of the literature review, identifies gaps in knowledge, and suggests areas for future research.
  • Edit and proofread: Once you have written your literature review, edit and proofread it carefully to ensure that it is well-organized, clear, and concise.

Examples of Literature Review

Here’s an example of how a literature review can be conducted for a thesis on the topic of “ The Impact of Social Media on Teenagers’ Mental Health”:

  • Start by identifying the key terms related to your research topic. In this case, the key terms are “social media,” “teenagers,” and “mental health.”
  • Use academic databases like Google Scholar, JSTOR, or PubMed to search for relevant articles, books, and other publications. Use these keywords in your search to narrow down your results.
  • Evaluate the sources you find to determine if they are relevant to your research question. You may want to consider the publication date, author’s credentials, and the journal or book publisher.
  • Begin reading and taking notes on each source, paying attention to key findings, methodologies used, and any gaps in the research.
  • Organize your findings into themes or categories. For example, you might categorize your sources into those that examine the impact of social media on self-esteem, those that explore the effects of cyberbullying, and those that investigate the relationship between social media use and depression.
  • Synthesize your findings by summarizing the key themes and highlighting any gaps or inconsistencies in the research. Identify areas where further research is needed.
  • Use your literature review to inform your research questions and hypotheses for your thesis.

For example, after conducting a literature review on the impact of social media on teenagers’ mental health, a thesis might look like this:

“Using a mixed-methods approach, this study aims to investigate the relationship between social media use and mental health outcomes in teenagers. Specifically, the study will examine the effects of cyberbullying, social comparison, and excessive social media use on self-esteem, anxiety, and depression. Through an analysis of survey data and qualitative interviews with teenagers, the study will provide insight into the complex relationship between social media use and mental health outcomes, and identify strategies for promoting positive mental health outcomes in young people.”

Reference: Smith, J., Jones, M., & Lee, S. (2019). The effects of social media use on adolescent mental health: A systematic review. Journal of Adolescent Health, 65(2), 154-165. doi:10.1016/j.jadohealth.2019.03.024

Reference Example: Author, A. A., Author, B. B., & Author, C. C. (Year). Title of article. Title of Journal, volume number(issue number), page range. doi:0000000/000000000000 or URL

Applications of Literature Review

some applications of literature review in different fields:

  • Social Sciences: In social sciences, literature reviews are used to identify gaps in existing research, to develop research questions, and to provide a theoretical framework for research. Literature reviews are commonly used in fields such as sociology, psychology, anthropology, and political science.
  • Natural Sciences: In natural sciences, literature reviews are used to summarize and evaluate the current state of knowledge in a particular field or subfield. Literature reviews can help researchers identify areas where more research is needed and provide insights into the latest developments in a particular field. Fields such as biology, chemistry, and physics commonly use literature reviews.
  • Health Sciences: In health sciences, literature reviews are used to evaluate the effectiveness of treatments, identify best practices, and determine areas where more research is needed. Literature reviews are commonly used in fields such as medicine, nursing, and public health.
  • Humanities: In humanities, literature reviews are used to identify gaps in existing knowledge, develop new interpretations of texts or cultural artifacts, and provide a theoretical framework for research. Literature reviews are commonly used in fields such as history, literary studies, and philosophy.

Role of Literature Review in Research

Here are some applications of literature review in research:

  • Identifying Research Gaps : Literature review helps researchers identify gaps in existing research and literature related to their research question. This allows them to develop new research questions and hypotheses to fill those gaps.
  • Developing Theoretical Framework: Literature review helps researchers develop a theoretical framework for their research. By analyzing and synthesizing existing literature, researchers can identify the key concepts, theories, and models that are relevant to their research.
  • Selecting Research Methods : Literature review helps researchers select appropriate research methods and techniques based on previous research. It also helps researchers to identify potential biases or limitations of certain methods and techniques.
  • Data Collection and Analysis: Literature review helps researchers in data collection and analysis by providing a foundation for the development of data collection instruments and methods. It also helps researchers to identify relevant data sources and identify potential data analysis techniques.
  • Communicating Results: Literature review helps researchers to communicate their results effectively by providing a context for their research. It also helps to justify the significance of their findings in relation to existing research and literature.

Purpose of Literature Review

Some of the specific purposes of a literature review are as follows:

  • To provide context: A literature review helps to provide context for your research by situating it within the broader body of literature on the topic.
  • To identify gaps and inconsistencies: A literature review helps to identify areas where further research is needed or where there are inconsistencies in the existing literature.
  • To synthesize information: A literature review helps to synthesize the information from multiple sources and present a coherent and comprehensive picture of the current state of knowledge on the topic.
  • To identify key concepts and theories : A literature review helps to identify key concepts and theories that are relevant to your research question and provide a theoretical framework for your study.
  • To inform research design: A literature review can inform the design of your research study by identifying appropriate research methods, data sources, and research questions.

Characteristics of Literature Review

Some Characteristics of Literature Review are as follows:

  • Identifying gaps in knowledge: A literature review helps to identify gaps in the existing knowledge and research on a specific topic or research question. By analyzing and synthesizing the literature, you can identify areas where further research is needed and where new insights can be gained.
  • Establishing the significance of your research: A literature review helps to establish the significance of your own research by placing it in the context of existing research. By demonstrating the relevance of your research to the existing literature, you can establish its importance and value.
  • Informing research design and methodology : A literature review helps to inform research design and methodology by identifying the most appropriate research methods, techniques, and instruments. By reviewing the literature, you can identify the strengths and limitations of different research methods and techniques, and select the most appropriate ones for your own research.
  • Supporting arguments and claims: A literature review provides evidence to support arguments and claims made in academic writing. By citing and analyzing the literature, you can provide a solid foundation for your own arguments and claims.
  • I dentifying potential collaborators and mentors: A literature review can help identify potential collaborators and mentors by identifying researchers and practitioners who are working on related topics or using similar methods. By building relationships with these individuals, you can gain valuable insights and support for your own research and practice.
  • Keeping up-to-date with the latest research : A literature review helps to keep you up-to-date with the latest research on a specific topic or research question. By regularly reviewing the literature, you can stay informed about the latest findings and developments in your field.

Advantages of Literature Review

There are several advantages to conducting a literature review as part of a research project, including:

  • Establishing the significance of the research : A literature review helps to establish the significance of the research by demonstrating the gap or problem in the existing literature that the study aims to address.
  • Identifying key concepts and theories: A literature review can help to identify key concepts and theories that are relevant to the research question, and provide a theoretical framework for the study.
  • Supporting the research methodology : A literature review can inform the research methodology by identifying appropriate research methods, data sources, and research questions.
  • Providing a comprehensive overview of the literature : A literature review provides a comprehensive overview of the current state of knowledge on a topic, allowing the researcher to identify key themes, debates, and areas of agreement or disagreement.
  • Identifying potential research questions: A literature review can help to identify potential research questions and areas for further investigation.
  • Avoiding duplication of research: A literature review can help to avoid duplication of research by identifying what has already been done on a topic, and what remains to be done.
  • Enhancing the credibility of the research : A literature review helps to enhance the credibility of the research by demonstrating the researcher’s knowledge of the existing literature and their ability to situate their research within a broader context.

Limitations of Literature Review

Limitations of Literature Review are as follows:

  • Limited scope : Literature reviews can only cover the existing literature on a particular topic, which may be limited in scope or depth.
  • Publication bias : Literature reviews may be influenced by publication bias, which occurs when researchers are more likely to publish positive results than negative ones. This can lead to an incomplete or biased picture of the literature.
  • Quality of sources : The quality of the literature reviewed can vary widely, and not all sources may be reliable or valid.
  • Time-limited: Literature reviews can become quickly outdated as new research is published, making it difficult to keep up with the latest developments in a field.
  • Subjective interpretation : Literature reviews can be subjective, and the interpretation of the findings can vary depending on the researcher’s perspective or bias.
  • Lack of original data : Literature reviews do not generate new data, but rather rely on the analysis of existing studies.
  • Risk of plagiarism: It is important to ensure that literature reviews do not inadvertently contain plagiarism, which can occur when researchers use the work of others without proper attribution.

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Writing Research Papers

  • Writing a Literature Review

When writing a research paper on a specific topic, you will often need to include an overview of any prior research that has been conducted on that topic.  For example, if your research paper is describing an experiment on fear conditioning, then you will probably need to provide an overview of prior research on fear conditioning.  That overview is typically known as a literature review.  

Please note that a full-length literature review article may be suitable for fulfilling the requirements for the Psychology B.S. Degree Research Paper .  For further details, please check with your faculty advisor.

Different Types of Literature Reviews

Literature reviews come in many forms.  They can be part of a research paper, for example as part of the Introduction section.  They can be one chapter of a doctoral dissertation.  Literature reviews can also “stand alone” as separate articles by themselves.  For instance, some journals such as Annual Review of Psychology , Psychological Bulletin , and others typically publish full-length review articles.  Similarly, in courses at UCSD, you may be asked to write a research paper that is itself a literature review (such as, with an instructor’s permission, in fulfillment of the B.S. Degree Research Paper requirement). Alternatively, you may be expected to include a literature review as part of a larger research paper (such as part of an Honors Thesis). 

Literature reviews can be written using a variety of different styles.  These may differ in the way prior research is reviewed as well as the way in which the literature review is organized.  Examples of stylistic variations in literature reviews include: 

  • Summarization of prior work vs. critical evaluation. In some cases, prior research is simply described and summarized; in other cases, the writer compares, contrasts, and may even critique prior research (for example, discusses their strengths and weaknesses).
  • Chronological vs. categorical and other types of organization. In some cases, the literature review begins with the oldest research and advances until it concludes with the latest research.  In other cases, research is discussed by category (such as in groupings of closely related studies) without regard for chronological order.  In yet other cases, research is discussed in terms of opposing views (such as when different research studies or researchers disagree with one another).

Overall, all literature reviews, whether they are written as a part of a larger work or as separate articles unto themselves, have a common feature: they do not present new research; rather, they provide an overview of prior research on a specific topic . 

How to Write a Literature Review

When writing a literature review, it can be helpful to rely on the following steps.  Please note that these procedures are not necessarily only for writing a literature review that becomes part of a larger article; they can also be used for writing a full-length article that is itself a literature review (although such reviews are typically more detailed and exhaustive; for more information please refer to the Further Resources section of this page).

Steps for Writing a Literature Review

1. Identify and define the topic that you will be reviewing.

The topic, which is commonly a research question (or problem) of some kind, needs to be identified and defined as clearly as possible.  You need to have an idea of what you will be reviewing in order to effectively search for references and to write a coherent summary of the research on it.  At this stage it can be helpful to write down a description of the research question, area, or topic that you will be reviewing, as well as to identify any keywords that you will be using to search for relevant research.

2. Conduct a literature search.

Use a range of keywords to search databases such as PsycINFO and any others that may contain relevant articles.  You should focus on peer-reviewed, scholarly articles.  Published books may also be helpful, but keep in mind that peer-reviewed articles are widely considered to be the “gold standard” of scientific research.  Read through titles and abstracts, select and obtain articles (that is, download, copy, or print them out), and save your searches as needed.  For more information about this step, please see the Using Databases and Finding Scholarly References section of this website.

3. Read through the research that you have found and take notes.

Absorb as much information as you can.  Read through the articles and books that you have found, and as you do, take notes.  The notes should include anything that will be helpful in advancing your own thinking about the topic and in helping you write the literature review (such as key points, ideas, or even page numbers that index key information).  Some references may turn out to be more helpful than others; you may notice patterns or striking contrasts between different sources ; and some sources may refer to yet other sources of potential interest.  This is often the most time-consuming part of the review process.  However, it is also where you get to learn about the topic in great detail.  For more details about taking notes, please see the “Reading Sources and Taking Notes” section of the Finding Scholarly References page of this website.

4. Organize your notes and thoughts; create an outline.

At this stage, you are close to writing the review itself.  However, it is often helpful to first reflect on all the reading that you have done.  What patterns stand out?  Do the different sources converge on a consensus?  Or not?  What unresolved questions still remain?  You should look over your notes (it may also be helpful to reorganize them), and as you do, to think about how you will present this research in your literature review.  Are you going to summarize or critically evaluate?  Are you going to use a chronological or other type of organizational structure?  It can also be helpful to create an outline of how your literature review will be structured.

5. Write the literature review itself and edit and revise as needed.

The final stage involves writing.  When writing, keep in mind that literature reviews are generally characterized by a summary style in which prior research is described sufficiently to explain critical findings but does not include a high level of detail (if readers want to learn about all the specific details of a study, then they can look up the references that you cite and read the original articles themselves).  However, the degree of emphasis that is given to individual studies may vary (more or less detail may be warranted depending on how critical or unique a given study was).   After you have written a first draft, you should read it carefully and then edit and revise as needed.  You may need to repeat this process more than once.  It may be helpful to have another person read through your draft(s) and provide feedback.

6. Incorporate the literature review into your research paper draft.

After the literature review is complete, you should incorporate it into your research paper (if you are writing the review as one component of a larger paper).  Depending on the stage at which your paper is at, this may involve merging your literature review into a partially complete Introduction section, writing the rest of the paper around the literature review, or other processes.

Further Tips for Writing a Literature Review

Full-length literature reviews

  • Many full-length literature review articles use a three-part structure: Introduction (where the topic is identified and any trends or major problems in the literature are introduced), Body (where the studies that comprise the literature on that topic are discussed), and Discussion or Conclusion (where major patterns and points are discussed and the general state of what is known about the topic is summarized)

Literature reviews as part of a larger paper

  • An “express method” of writing a literature review for a research paper is as follows: first, write a one paragraph description of each article that you read. Second, choose how you will order all the paragraphs and combine them in one document.  Third, add transitions between the paragraphs, as well as an introductory and concluding paragraph. 1
  • A literature review that is part of a larger research paper typically does not have to be exhaustive. Rather, it should contain most or all of the significant studies about a research topic but not tangential or loosely related ones. 2   Generally, literature reviews should be sufficient for the reader to understand the major issues and key findings about a research topic.  You may however need to confer with your instructor or editor to determine how comprehensive you need to be.

Benefits of Literature Reviews

By summarizing prior research on a topic, literature reviews have multiple benefits.  These include:

  • Literature reviews help readers understand what is known about a topic without having to find and read through multiple sources.
  • Literature reviews help “set the stage” for later reading about new research on a given topic (such as if they are placed in the Introduction of a larger research paper). In other words, they provide helpful background and context.
  • Literature reviews can also help the writer learn about a given topic while in the process of preparing the review itself. In the act of research and writing the literature review, the writer gains expertise on the topic .

Downloadable Resources

  • How to Write APA Style Research Papers (a comprehensive guide) [ PDF ]
  • Tips for Writing APA Style Research Papers (a brief summary) [ PDF ]
  • Example APA Style Research Paper (for B.S. Degree – literature review) [ PDF ]

Further Resources

How-To Videos     

  • Writing Research Paper Videos
  • UCSD Library Psychology Research Guide: Literature Reviews

External Resources

  • Developing and Writing a Literature Review from N Carolina A&T State University
  • Example of a Short Literature Review from York College CUNY
  • How to Write a Review of Literature from UW-Madison
  • Writing a Literature Review from UC Santa Cruz  
  • Pautasso, M. (2013). Ten Simple Rules for Writing a Literature Review. PLoS Computational Biology, 9 (7), e1003149. doi : 1371/journal.pcbi.1003149

1 Ashton, W. Writing a short literature review . [PDF]     

2 carver, l. (2014).  writing the research paper [workshop]. , prepared by s. c. pan for ucsd psychology.

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  • Research Paper Structure
  • Formatting Research Papers
  • Using Databases and Finding References
  • What Types of References Are Appropriate?
  • Evaluating References and Taking Notes
  • Citing References
  • Writing Process and Revising
  • Improving Scientific Writing
  • Academic Integrity and Avoiding Plagiarism
  • Writing Research Papers Videos

The independent source for health policy research, polling, and news.

Building on the Evidence Base: Studies on the Effects of Medicaid Expansion, February 2020 to March 2021

Madeline Guth and Meghana Ammula Published: May 06, 2021

  • Introduction
  • Bibliography

Themes in Recent Research

Several key themes emerge from recent literature investigating the effects of Medicaid expansion (Figure 1). In contrast to earlier research , which largely focused on the impacts of Medicaid expansion for the general population or for low-income populations, recent research has increasingly focused on outcomes for specific populations, such as people with cancer or behavioral health needs. Recent research has also focused on specific outcomes such as mortality and social determinants of health. Although overall findings across these themes generally show positive effects of Medicaid expansion, a smaller number of studies find no impact of expansion on specific outcomes for specific populations; however, very few studies suggest any negative effects.

Many studies published between February 2020 and March 2021 and cited throughout this report have findings across multiple of these themes and are thus cited in multiple sections. Additionally, many studies on expansion published prior to February 2020 also have findings related to these themes but are not cited in this report; however, these can be found cited in an earlier literature review and are also included in the Bibliography and Appendices to this report.

review of literature of a research report

Figure 1: Recent studies find positive effects of the ACA Medicaid expansion across a range of categories.​

A growing body of research finds that Medicaid expansion has improved overall mortality rates as well as mortality rates associated with some specific health conditions. These findings are consistent with earlier research identifying that expansion contributed to declines in overall and some specific mortality rates, but had no effect on mortality rates associated with other specific conditions.

  • Overall mortality. A 2020 national study found that expansion was associated with a significant 3.6% decrease in all-cause mortality, the majority of which was accounted for by a significant 1.93% decrease in health care amenable mortality. Another study found that expansion was associated with reductions in health care amenable mortality and in mortality not due to drug overdose. 1 , 2
  • Studies find that expansion was associated with significant declines in mortality related to certain specific conditions, in some instances limited to certain subgroups. These findings include decreased mortality associated with different types of cancer, cardiovascular disease, and liver disease. Studies also find decreased maternal mortality, and one study found a decrease in infant mortality among Hispanics only. 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10
  • However, other studies suggest no effect of expansion on mortality among safety-net hospital patients, individuals with glottic cancer, individuals with glioblastoma, patients undergoing hemodialysis, and overall infant mortality. One study found no significant difference between COVID-19 mortality rates in expansion versus non-expansion states, despite lower incidence rates in expansion states. One study concluded that available data was insufficient to adequately identify the impact of expansion on opioid mortality. 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19

Cancer, Chronic Disease, and Disabilities

Recent research finds largely positive impacts of expansion on coverage and access to care among populations with cancer, chronic disease, and/or disabilities. However, findings on utilization of care and health outcomes are more mixed, with some studies suggesting improvements and others finding no effect of expansion. These studies build on prior research indicating generally positive effects of expansion for populations with cancer and other health conditions. Recent research also provides additional evidence on expansion’s impacts across a range of chronic conditions considered by the CDC to put people at higher risk of severe illness and death from COVID-19 (such as diabetes, obesity, and lung and heart conditions).

  • Coverage of people with cancer . Studies overwhelmingly find that Medicaid expansion has increased insurance coverage rates among cancer patients and survivors. Research also finds changes in payer mix of care for patients with cancer, with declines in the proportion of uninsured patients and increases in the proportion of Medicaid-insured patients. 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43
  • Cancer diagnosis, treatment, and outcomes. Most studies find an association between expansion and increases in early-stage diagnosis rates among cancer patients, suggesting that expansion has facilitated earlier utilization of care for these patients. Findings on utilization of cancer treatment services and on access to timely treatment are mixed, though more studies find improvements as compared to studies that find no effect of expansion. Of studies that consider cancer mortality, three suggest improvements for patients with certain types of cancer, while three suggest no effect for patients with other types of cancer. 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75
  • Cancer screening and prevention. Several studies find that expansion increased receipt of cancer screenings such as mammograms, though a similar number of studies find no effect of expansion on screening rates for certain cancers. Two studies identified an association between expansion and increased rates of human papillomavirus (HPV) vaccines (overall and among teenagers specifically), while a third found no effect of expansion on HPV vaccination rates among female community health center patients. 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84
  • Diabetes . Studies find that expansion increased insurance coverage rates among adults and teenagers with diabetes. Although research indicates that expansion increased affordability of health care for populations with diabetes, findings on utilization of preventive care and treatment are more mixed (between studies finding improvements and studies finding no effect). Two studies identified improvements in diabetes biomarkers among community health center patients following expansion. Two studies that considered women of reproductive age found that expansion did not affect the prevalence of diabetes prior to or during pregnancy. 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96
  • Other chronic disease . In addition to cancer and diabetes, research also considers a range of other chronic conditions including cardiovascular and pulmonary diseases, obesity, and liver disease. Studies find that among those with chronic disease, expansion contributed to increased insurance coverage and improvements in payer mix, improved access to care, and better health outcomes including disease management and mortality. Findings on effects on treatment utilization and quality of care were mixed (between studies finding improvements and studies finding no effect). Finally, studies generally suggest that expansion increased screening for chronic conditions but did not reduce the prevalence of these conditions except for smoking. 97 , 98 , 99 , 100 , 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123
  • People with disabilities . A small number of recent studies consider the impacts of expansion for people with disabilities. One study found increased coverage options for people with disabilities in expansion states, while other studies suggested no effect of expansion on utilization of care or employment among this population. One study found that expansion improved mental health outcomes for caregivers of people with disabilities. 124 , 125 , 126 , 127 , 128

Sexual and Reproductive Health

Recent research finds that expansion has contributed to improvements in a number of outcomes related to sexual and reproductive health. This body of research includes findings related to women’s health and HIV/AIDS outcomes, both areas of health care that have faced increased challenges during the coronavirus pandemic. Building on prior research finding positive impacts among people of reproductive age, recent research indicates that expansion has improved measures including coverage rates before, during, and after pregnancy; maternal mortality and infant health outcomes; utilization of the most effective contraceptive methods; and screening for HIV/AIDS.

  • Maternal and infant health outcomes. Studies find that expansion significantly increased access to and utilization of health care for pregnant women and mothers. Two studies found significant declines in maternal mortality, in contrast to one study which found no impact of expansion on certain health outcomes during pregnancy. Studies generally suggest an association between expansion and improvements in birth outcomes such as low birthweight, but find no impact on infant mortality (except for one study which found a reduction in Hispanic infant mortality only). 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140
  • Postpartum insurance coverage. Although the American Rescue Plan Act of 2021 created a new option to expand postpartum coverage to 12 months via a State Plan Amendment, current federal statute requires that pregnancy-related Medicaid coverage continue through just 60 days. Research indicates that ACA Medicaid expansion has decreased coverage loss after this 60-day period ends: all recent studies that consider rates of insurance coverage after pregnancy find that expansion significantly increased postpartum coverage. Studies also suggest an association between expansion and increased coverage prior to and during pregnancy. 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149
  • Access to contraception. Most studies find that expansion increased utilization of the most effective contraception methods (long-acting reversible contraception, which includes IUDs and implants ); however, studies generally find no effect on overall contraception use. One study found an association between expansion and improved payer mix for contraceptive visits at safety net clinics, with a decline in the proportion of uninsured patients and an increase in the proportion of publicly-insured patients. 150 , 151 , 152 , 153 , 154 , 155
  • HIV/AIDS screening and outcomes. Studies suggest that expansion increased overall rates of HIV screening, including one study that found that increases in HIV test and diagnosis rates occurred despite no change in actual HIV incidence. Research also indicates higher insurance coverage rates among people with or at risk of HIV, increased utilization of Pre-Exposure Prophylaxis (PrEP) to treat HIV, and improved quality of care for patients with HIV. 156 , 157 , 158 , 159 , 160 , 161 , 162 , 163 , 164 , 165 , 166 , 167

Behavioral Health

A growing body of research finds that expansion is associated with improvements in access to care and outcomes related to substance use disorder (SUD) as well as other mental health care. These findings are consistent with prior research indicating positive effects of expansion on behavioral health care access and outcomes. Recent research on SUD largely focuses on opioid use disorder (OUD) specifically, which is more prevalent among Medicaid enrollees as compared to the general population. Given the impacts of the coronavirus pandemic on mental health and substance use , Medicaid expansion coverage is likely to continue to serve as a significant source of coverage for behavioral health care.

  • Access to care and outcomes for SUD. Studies find that Medicaid expansion was associated with increased insurance coverage among adults with SUD and improved payer mix of SUD-related visits (declines in uninsured patients and/or increases in Medicaid-covered patients). Studies also find that expansion increased the receipt of medication assisted treatment (MAT) prescriptions for the treatment of OUD, and that following expansion opioid treatment facilities were more likely to offer MAT and comprehensive mental health services. In contrast, a small number of studies found no effect of expansion on utilization of certain health care services for SUD. One study found no effect of expansion on drug-overdose deaths, while a second concluded that available data was insufficient to adequately identify the impact of expansion on drug-related mortality. 168 , 169 , 170 , 171 , 172 , 173 , 174 , 175 , 176 , 177 , 178 , 179 , 180 , 181
  • Mental health care access and outcomes . Studies find that expansion increased access to care for adults with mental health conditions such as depression, including by increasing the likelihood that mental health care providers accepted Medicaid. Findings on utilization of mental health care are more mixed, with some studies suggesting increased utilization of services such as mental health care via telehealth , and others finding no effect of expansion on other mental health services. Findings on mental health outcomes are also mixed: one study found that expansion was associated with improvements in self-reported mental health among low-income adults, while two other studies found no impact on similar measures among near-elderly adults and among women of reproductive age. 182 , 183 , 184 , 185 , 186 , 187 , 188 , 189 , 190 , 191 , 192 , 193

Economic Impacts on States and Providers

Building on prior research, recent studies identify positive financial impacts of Medicaid expansion for states, hospitals, and other providers. These studies join a body of prior research finding overwhelmingly positive effects of expansion on economic outcomes (see Appendix A, Figure 5). These economic findings are particularly relevant given fiscal stress experienced by both states and Medicaid providers during the coronavirus pandemic.

  • State budgets and economies. All recent studies that consider the financial impacts of expansion for states find positive effects. Studies find that expansion states experienced increased federal Medicaid spending. One study found that through 2018, Medicaid expansion led to increased federal spending in expansion states but very small (<1%), insignificant increases in spending from state sources (including in 2017 and 2018 when states began paying 5% and 6% of expansion costs respectively, a rate that was subsequently phased to 10% in 2020 and beyond). In addition, Medicaid expansion did not crowd out other areas of state spending and states that did not expand passed up $43 billion in federal funds in 2018. Research also finds that expansion resulted in increased revenue as well as net state savings by offsetting state costs in other areas, such as state spending on substance use disorder (SUD) treatment and on the traditional Medicaid program. One study found that the mortality reductions associated with expansion resulted in between $20.97 and $101.8 billion in annual welfare gains, implying that mortality-related savings alone may offset the entire net cost of expansion. 194 , 195 , 196 , 197 , 198
  • Payer mix. Studies overwhelmingly find that Medicaid expansion has resulted in payer mix improvements (declines in uninsured patients and/or increases in Medicaid-covered patients). Findings include payer mix improvements for hospitalizations, emergency department visits, and visits to community health centers and other safety-net clinics. Studies identify payer mix improvements among patients hospitalized for a range of specific conditions including traumatic injuries, surgeries, and treatment for substance use disorder. In line with payer mix improvements, studies also find decreased uncompensated care costs (UCC) overall and for specific types of hospitals, including those in rural areas. 199 , 200 , 201 , 202 , 203 , 204 , 205 , 206 , 207 , 208 , 209 , 210 , 211 , 212 , 213 , 214 , 215 , 216 , 217 , 218 , 219 , 220 , 221 , 222 , 223 , 224 , 225 , 226 , 227 , 228 , 229 , 230
  • Financial performance of hospitals and other providers. Research finds that expansion contributed to increased hospital revenue overall and from specific services. Although studies find that expansion has improved provider operating margins and profitability, these findings vary by hospital type. For example, one study found that despite declines in UCC and increases in Medicaid revenue across all hospital types, only hospitals in non-metropolitan areas and small hospitals experienced improved profit margins; another study similarly found gains in overall revenue only for rural and small hospitals. A few studies suggest that improvements in payer mix and UCC at hospitals may have been partially offset by increases in unreimbursed Medicaid care and declines in commercial revenue. One recent study found that expansion reduced the number of annual hospital closures. 231 , 232 , 233 , 234 , 235 , 236 , 237 , 238 , 239 , 240 , 241

Disparities

A growing body of research considers the impact of Medicaid expansion on disparities in different outcomes by race/ethnicity, socioeconomic status, and other categories. These studies build on an earlier literature review finding that expansion has helped to narrow racial disparities in coverage and certain health outcomes, with more limited evidence suggesting reduced racial disparities in access to and use of care. Some studies on racial/ethnic disparities cited here are also included in this earlier review, which included studies published through July 2020.

  • Disparities by race/ethnicity. Findings on expansion’s impact on racial disparities in health coverage, access, and outcomes are mixed and generally mirror findings from a previous literature review , with evidence of decreased racial disparities for some populations in measures including coverage rates, affordability of care, utilization of surgery and other services, and health outcomes including maternal and infant mortality. However, similar numbers of studies identify no effect of expansion on racial disparities in these and other measures. A very small number of studies find evidence of increased racial disparities (in coverage rates for specific populations and in breast cancer mortality). Across outcomes, most research focuses on disparities for Black and Hispanic individuals, with limited findings on impacts for other groups of color. 242 , 243 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 , 253 , 254 , 255 , 256 , 257 , 258 , 259 , 260 , 261 , 262 , 263 , 264 , 265 , 266 , 267 , 268 , 269 , 270 , 271 , 272 , 273 , 274 , 275 , 276 , 277 , 278 , 279 , 280
  • Disparities by socioeconomic status (income and/or education). In contrast to research on racial disparities, recent studies that consider socioeconomic disparities all find improvements. Studies find that expansion has reduced disparities in coverage by income and/or education status, including for populations with certain cancer diagnoses. A smaller number of studies also find decreased socioeconomic disparities in utilization of care, certain health outcomes such as maternal mortality, and individual financial stability. 281 , 282 , 283 , 284 , 285 , 286 , 287 , 288 , 289 , 290 , 291
  • Disparities by other categories. A few recent studies identify an association between expansion and reduced coverage disparities by age, sex, and marital status, but no effect on coverage disparities by work status and obesity. One study found that expansion reduced age disparities in individual financial stability. Another study found no effect of expansion on disparities by sex in receipt of HIV tests. 292 , 293 , 294 , 295 , 296 , 297 , 298

Social Determinants of Health

Recent research indicates largely positive impacts of expansion associated with different social determinants of health. These recent studies are consistent with prior research on expansion’s effect on social determinants of health and also contribute new evidence on effects for certain measures. Social determinants of health are the conditions in which people are born, grow, live, work, and age. Improvements in these measures associated with expansion could help to mitigate increased hardship due to the coronavirus pandemic.

  • Access to care in rural areas. Studies find that expansion was associated with greater improvements in access to care in rural areas, including increased HIV diagnosis rates and access to mental health care. In contrast, one study found that utilization of tobacco cessation treatment remained limited in rural Appalachia even after Medicaid expansion in Kentucky. Research also suggests that rural hospitals experienced particularly substantial improvements in financial performance following expansion. 299 , 300 , 301 , 302 , 303 , 304 , 305 , 306 , 307
  • Impacts on economic stability, employment, and educational outcomes. Studies find that expansion decreased catastrophic health expenditures (health care spending as a percentage of family income). One study found that expansion was associated with greater increases in income among low-income individuals and contributed to decreased levels of income inequality. One study found an association between expansion and decreased odds of job loss, though two other studies found no effect of expansion on employment among people with disabilities. Finally, a national study found significant reductions in high school dropout rates in the first year of expansion implementation, which would translate to an 11.2% reduction in drop-out rates in non-expansion states if they adopted the expansion. 308 , 309 , 310 , 311 , 312 , 313 , 314
  • Outcomes for justice-involved and individuals experiencing homelessness. One study found that although pregnant women referred by criminal justice agencies to opioid use disorder (OUD) treatment facilities received medication as treatment at lower rates than women referred by other sources, expansion mitigated this effect by increasing receipt of medication for these women. Another study found that expansion resulted in decreased rates of recidivism in some geographic areas. A study in Arkansas found a spike in utilization of acute care among adults experiencing homelessness who gained coverage through expansion, suggesting a pent-up demand that stabilized in the years following expansion implementation. 315 , 316 , 317  

Looking Ahead

This literature review builds on a prior report and summarizes new evidence on more specific outcomes for certain populations. The full body of Medicaid expansion research includes over 600 studies (summarized in Appendix A) and indicates overall positive effects across a range of outcomes for patients, providers, and states. These findings suggest that Medicaid expansion could help mitigate adverse impacts of the coronavirus pandemic at the patient, provider, and state level; although research to date on Medicaid expansion and COVID-19 remains limited, future studies will likely further consider these impacts. Additionally, continued research cited in this report demonstrating positive economic impacts may help inform states still debating whether to adopt the expansion , particularly given the new ARPA financial incentive that would more than offset state expansion costs for two years (after which states would continue to bear 10% of the cost). Future policy proposals at the state and federal level could further affect Medicaid expansion coverage and options for people in the coverage gap .

The authors thank Diana Park for her assistance reviewing studies for inclusion and compiling supplemental materials.

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  • The Effects of Medicaid Expansion under the ACA: Studies from January 2014 to January 2020
  • New Incentive for States to Adopt the ACA Medicaid Expansion: Implications for State Spending
  • Status of State Medicaid Expansion Decisions: Interactive Map
  • What Does the Recent Literature Say About Medicaid Expansion?: Economic Impacts on Providers

Primary hepatic chronic expanding hematoma: a case report and literature review

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Cite this article

  • Masashi Nakagawa 1 ,
  • Naokazu Chiba 1 ,
  • Takahiro Gunji 1 ,
  • Toru Sano 1 ,
  • Koichi Tomita 1 ,
  • Masatoshi Shigoka 1 ,
  • Satoshi Tabuchi 1 ,
  • Eiji Hidaka 1 ,
  • Munehide Nakatsugawa 1 , 2 &
  • Shigeyuki Kawachi 1  

Chronic expanding hematoma (CEH), first reported in 1968, is a hematoma that gradually enlarges over a long course of time after an initial period of bleeding. It can occur anywhere in the body; however, there are many reports of its occurrence in the thoracic cavity. Primary hepatic CEH is extremely rare. In this current study, we report on a case of primary hepatic CEH diagnosed preoperatively, with a review of the literature. A 68-year-old man presented with liver dysfunction. Abdominal computed tomography revealed a giant cystic tumor in the left lobe of the liver, with a longer axis of approximately 12 cm. Magnetic resonance imaging revealed a mosaic pattern with a mixture of high and low signals within the tumor on T1-weighted images and a high signal at the tumor margin on T2-weighted images. Based on these findings, primary hepatic CEH was suspected. However, other malignant tumors could not be excluded owing to tumor compression resulting in bile duct dilatation. Left trisectionectomy was performed, followed by bile duct drainage and percutaneous transhepatic portal vein embolization. Intraoperative hemorrhage was controlled by the Pringle maneuver and with temporary clamping of the inferior vena cava. Pathological examination revealed a pseudocyst containing a clot, consistent with CEH. In conclusions, the case report illustrates the potential to enhance preoperative diagnosis, inform surgical approaches, and minimize associated risks. Furthermore, it highlights the importance of increasing awareness and research on this condition for improved clinical decision-making and patient care.

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Department of Digestive and Transplantation Surgery, Tokyo Medical University Hachioji Medical Center, 1163 Tatemachi Hachioji, Tokyo, 193-0998, Japan

Masashi Nakagawa, Naokazu Chiba, Takahiro Gunji, Toru Sano, Koichi Tomita, Masatoshi Shigoka, Satoshi Tabuchi, Eiji Hidaka, Munehide Nakatsugawa & Shigeyuki Kawachi

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Study design: MN, NC and SK. Acquisition of data were performed by all authors. Operation procedures: MN and NC. Analysis and interpretation: MN, NC and MN. Manuscript drafted by MN and NC. Revision: NC and SK.

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Nakagawa, M., Chiba, N., Gunji, T. et al. Primary hepatic chronic expanding hematoma: a case report and literature review. Clin J Gastroenterol (2024). https://doi.org/10.1007/s12328-024-01927-w

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The complexity of leadership in coproduction practices: a guiding framework based on a systematic literature review

  • Sofia Kjellström 1 , 2 ,
  • Sophie Sarre 2 &
  • Daniel Masterson 1  

BMC Health Services Research volume  24 , Article number:  219 ( 2024 ) Cite this article

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As coproduction in public services increases, understanding the role of leadership in this context is essential to the tasks of establishing relational partnerships and addressing power differentials among groups. The aims of this review are to explore models of coproduction leadership and the processes involved in leading coproduction as well as, based on that exploration, to develop a guiding framework for coproduction practices.

A systematic review that synthesizes the evidence reported by 73 papers related to coproduction of health and welfare.

Despite the fact that models of coleadership and collective leadership exhibit a better fit with the relational character of coproduction, the majority of the articles included in this review employed a leader-centric underlying theory. The practice of coproduction leadership is a complex activity pertaining to interactions among people, encompassing nine essential practices: initiating, power-sharing, training, supporting, establishing trust, communicating, networking, orchestration, and implementation.

Conclusions

This paper proposes a novel framework for coproduction leadership practices based on a systematic review of the literature and a set of reflective questions. This framework aims to help coproduction leaders and participants understand the complexity, diversity, and flexibility of coproduction leadership and to challenge and enhance their capacity to collaborate effectively.

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Introduction

For more than 40 years, scholars and practitioners have sought to identify and understand various aspects of coproduction with the goal of improving services as well as equalizing (or at least reorganizing) power relations in service design and delivery [ 1 ]. More recently, such discussion has focused on the roles of leaders and leadership in coproduction, seeking to describe and assess the various types of leaders and leadership that might maximize the goals of coproduction processes and outcomes. Leaders can act to make coproduction, in all its forms, happen [ 2 , 3 ]. Leaders can enhance coproduction by providing resources, establishing inviting structures, and prioritizing the involvement of various stakeholders. Conversely, they can inhibit coproduction by perpetuating conservative administrative cultures, failing to provide training, or being reluctant to share power [ 3 ]. Coproduction relies on leadership at all levels, ranging from senior managers to local “champions” and including the citizens and third-sector organizations that participate in coproduction activities and practices.

This review presents a synthesis of research on the leadership of coproduction, which has been recognized for its scarcity [ 3 , 4 , 5 , 6 ]. The review provides new knowledge regarding the fact that coproduction leadership must become more deliberately (in)formed by collective leadership models. It also illustrates the multiplicity and complexity associated with coproduction leadership activities by outlining practices in which leaders must engage to ensure success. This review can inform a framework that offers guiding insights on which commissioners, evaluators, managers and leaders of coproduction can reflect as well as suggestions and directions for future research.

  • Coproduction

Coproduction is a broad concept that is associated with different meanings across a range of contexts [ 1 ]. Many definitions and uses of the term coproduction and codesign have been identified [ 7 ]. Throughout this paper, although we acknowledge the distinctions associated with the concepts and origins of the notion of codesign, we use the broad term coproduction to refer to some form of collaboration or partnership between service providers and service users or citizens. For this review, we follow the definitions provided by Osborne and Strokosch [ 8 ], who identified ‘ consumer coproduction’ as an inevitable component of value creation in interactions among service providers; ‘participatory coproduction’, in which context participation is deliberative and occurs at the strategic level of service design and planning; and ‘enhanced coproduction’, which represents a potential mechanism for transforming organizational processes and boundaries.

Power is inevitably central to coproduction. Schlappa and Ymani claimed that the coproduction process is “inherently negotiated, emergent and reliant on a range of actors who may have both common and contrasting motivations, and are able to exercise power, which in turn is moderated by the context in which these relations occur” [ 6 ]. This sensitivity to motivation, context and power is helpful for our understanding of leadership in coproduction.

Leadership models

Most conceptualizations of leadership have been based on the claim that leadership is a kind of inherent characteristic exhibited by human beings, such that leaders are depicted as heroes with unique traits, styles or behaviours [ 9 ]. However, research on leadership in coproduction is important in relation to an emerging body of research that focuses on the notion of “leadership in the plural” [ 10 ] or “collective leadership” [ 11 , 12 ]. These phrases act as umbrella terms that refer to overlapping concepts such as shared, collaborative, distributed, pooled and relational leadership. A core feature of these models is that leadership is not (only) viewed as a property of individuals and their behaviours but rather as a collective phenomenon that is distributed or shared among different people [ 10 ]. A distinction can be made between two types of collective leadership. Leadership can be shared in interpersonal relationships; for example, it can be pooled among duos or trios at the top of an organization, or shared leadership can be exercised within teams working on a project. This notion is based upon the assumption that people have different skills that complement each other. The second kind of collective leadership is a more radical version of this notion, according to which leadership emerges as a result of direction, alignment, and commitment within a group [ 11 ] or can be observed to reside within the system, for example, in the form of distributed leadership across interorganizational and intraorganizational boundaries and networks [ 10 , 12 ]. In cross-sectoral collaboration, leadership is distributed across time and space, which requires structures to guide how leadership is shared and organized. It has been argued that collective leadership is best suited to the analysis of coproduction practices [ 4 , 6 , 13 , 14 ].

It is important to note that distinctions have been made between management (planning, monitoring and controlling) and leadership (creating a vision, inspiring and changing) based on behaviours [ 15 ]. However, many authors have not made such a distinction, and the terms have frequently been used interchangeably. We therefore adopt the practice employed in the papers included in this review and use the terms leadership and leader as catch-all terms; we only use the words management or manager when the papers refer to job titles or ‘public management’.

Leadership models can be regarded as resembling a colour palette that offers a variety of choices, and similar to colours, some models fit a situation better than others. This paper investigates the use and fit of various leadership models for coproduction.

Leadership of coproduction research

Extant research on the leadership of coproduction has been described as “sparse” [ 4 ], a “neglected area” [ 5 ] and “overlooked” [ 3 , 6 ]. Despite a recent resurgence of interest in the potential of coproduction as a means of maintaining and improving the quality of health and social care, significant questions regarding how coproduction can and should be led in this context remain unanswered. Most reviews of coproduction have not addressed this issue [ 2 , 16 , 17 , 18 ]. Clarke et al.’s (2017) review identified the lack of managerial authority and leadership as a key barrier to the implementation of coproduced interventions but did not explore the implications of this finding for future practice. The review conducted by Bussu and Galanti (2018) stands alone in its focus on leadership, although the empirical cases explored by those authors were restricted to the context of local government in the UK. Recent empirical case studies that have explored leadership [ 13 , 14 , 15 , 19 ] have focused on public managers [ 3 , 5 , 14 ] or on identifying the consequences of different models of leadership. This review contributes to the literature by providing knowledge regarding how to make deliberate choices pertaining to coproduction leadership in terms of how it is conceptualized and shared and the activities that are necessary for leading coproduction.

Coproduction leadership practices

The leadership of coproduction poses a number of challenges. A proposed aim of coproduction is to drive change within services and in traditional state-citizen relationships by establishing equal and reciprocal relationships among professionals, the people using services, and their families and neighbours. This task requires a restructuring of health and welfare services to equalize power between providers and other stakeholders with an interest in the design and provision of these services. However, it has been suggested that coproduction runs the risk of reproducing existing inequalities in power rather than mitigating them since coproduction is inevitably saturated with unequal power relations that must be acknowledged but cannot be managed away [ 20 ].

In this paper, we present the findings of a systematic review of the literature on leadership in coproduction. The purpose of this review is to explore models of coproduction leadership and the practices involved in leading coproduction in the context of health and social care sectors [ 7 ]. The results are synthesized to develop a framework for actors who seek to commission, design, lead or evaluate coproduction processes. This framework emphasizes the need to make more deliberate choices regarding the underlying conceptualization of leadership and the ways in which such a conceptualization is related to the activities necessary for leading coproduction. Based on the framework, we also propose specific guiding questions for individuals involved in coproduction in practice and make suggestions for future research.

This systematic literature review is based on a study protocol on coproduction research in the context of health and social care sectors [ 21 ], and data were obtained from a published scoping review, where the full search strategy is provided [ 7 ]. The scoping review set out to identify ‘what is out there’ and to explore the definitions of the concepts of coproduction and codesign. In brief, the following search terms for the relevant concept (co-produc* OR coproduc* OR co-design* OR codesign*) and context (health OR social OR & “public service*” OR “public sector”) were used to query the following databases: CINAHL with Full Text (EBSCOHost), Cochrane Central Register of Controlled Trials (Wiley), MEDLINE (EBSCOhost), PsycINFO (ProQuest), PubMed (legacy), and Scopus (Elsevier). This paper focused on leadership. All titles and abstracts included in the scoping review ( n  = 979) were obtained and searched for leadership concepts (leader* OR manage*) ( n  = 415). These materials were reviewed independently by SK and SS using the following inclusion criterion: conceptual, empirical and reflection papers that included references to the management and/or leadership of coproduction. Study protocols were excluded because we wanted to capture lessons drawn from implementation, and conference papers were excluded because they lacked sufficient detail. Articles focusing on the context of individual-level coproduction (i.e., cases in which an individual client or patient was the focus of coproduction) were excluded, as we were interested in the leadership processes involved in collective coproduction. Conflicts were resolved through discussion and further consideration of disputed papers. This process led to the inclusion of 73 articles (Fig.  1 – PRISMA flow chart).

figure 1

PRISMA flow chart

The method used for this research was a systematic review with qualitative synthesis. The strength of this approach lies in its ability to complement research evidence with user and practitioner considerations [ 22 ]. In the process of examining the full texts of the papers, two researchers (SK and SS) extracted background data independently. To promote coproduction, four stakeholders were strategically selected through the personal networks of one of the authors, SK. These stakeholders exhibited diverse expertise in the leadership of coproduction. One was a leadership developer and family member of an individual with 24/7 care needs. Another was a physician. The third worked in peer support and had personal experience with mental health services. The fourth was a health care leader. Four key articles were chosen due to the diversity of leadership ideas they exhibit and the depth of the explicit text on leadership they provided. During the analysis by stakeholders, no themes were changed or refined; instead, the analysis confirmed the relevance of the initially identified themes, thus emphasizing the robustness of our findings based on a process that involved reading four key articles and identifying the perceived key implications for our research aim.

A qualitative synthesis unites the findings of individual studies in a different arrangement, thereby constructing new knowledge that is not apparent from the individual studies in isolation [ 23 ]. This fact is particularly evident in this review, since leadership was seldom the main focus of the included articles. Accordingly, we employed multiple pieces of information to construct a pattern. The process of synthesis started at a very broad level with the goal of understanding which aspects of leadership were addressed in the literature. This process then separated into two strands. One such strand focused on interpreting the data from the perspective of current leadership models, while the other focused on interpreting leadership practices – i.e., the activities and relationships that are part of the process of leading coproduction. We searched for themes both within and across individual articles, and our goal was interpretative rather than purely aggregative. This process resulted in three themes pertaining to coproduction leadership models and nine coproduction leadership practices. We present these findings together in the form of a framework because consideration of both leadership models and practices prompts better and more conscious choices, which can improve the quality of coproduction. Persons one and two from the stakeholder group also provided feedback on a draft of this paper, and their insights were integrated into this research.

Sample description

We included 73 papers (Additional file 1 ) dating from 1994 to 2019 (the year in which the initial search was performed). Most of these papers were empirical ( n  = 54), and more than half of them were case studies ( n  = 30). Fifteen articles were conceptual papers, and four were literature reviews. The setting or focus of the papers was predominantly on services ( n  = 66), while the remainder of the papers were on research ( n  = 4) or policy ( n  = 3). The papers drew on evidence collected from 13 countries, and the most common national setting was the UK ( n  = 29). Nine cross-national papers were also included. Issues related to leadership were rarely the focus of the papers.

Results: A coproduction leadership framework

The synthesis consists of three parts (roles, models and practices), which are combined to develop an overarching and integrative framework for essential issues pertaining to coproduction leadership [ 4 , 24 ].

People and roles

The way in which the leadership of coproduction has been conceptualized in the literature suggests that a range of actors are involved in the coproduction of health and wellbeing and that these actors can take on different leadership roles and functions. Service users, community members and community representatives can play a vital role in the task of deliberatively coproducing or even transforming services, as can third-sector organizations, external experts, politicians, mid-level facilitators, managers, and senior leaders.

It has been argued that it is important to involve leaders from diverse backgrounds who have personal experiential knowledge of public involvement to encourage involvement from a broader population [ 25 , 26 , 27 ]. Service users and community members play leadership roles in coproduction initiatives related to health or well-being. These roles involve shared decision-making and accountability at various levels, ranging from the personal to the systemic.

Senior leaders include formal representatives of organizations (executives, politicians, or formal managers) and formal or respected leaders of communities. They play an important role throughout this process. During the initiation stage, by implementing and sustaining the outcomes of coproduction, they play a crucial role in the provision of resources such as time, money, materials, and access to networks. In the interim stages, their commitment to coproduction, sponsorship, and engagement is vital.

Champions and ambassadors use their expertise and passion to drive coproduction efforts. In particular, "insider" champions can establish trust among participants and help service providers understand the importance of coproduction. These champions advocate for coproduction and actively support initiatives [ 28 , 29 , 30 , 31 ]. Ambassadors are individuals who have expertise and volunteer their time to train others or work with clients in coproduced services. They play a crucial role in the tasks of supporting and promoting coproduction [ 28 , 32 , 33 ].

Project leaders and facilitators are individuals who are responsible for guiding and supporting coproduction projects, thereby ensuring their smooth operation and collaborative nature. Project leaders are responsible for overall project management, including the setting of goals, objectives, and timelines. They play a pivotal role in ensuring that projects remain on track, and they facilitate accessible and transparent dialogue among stakeholders and ensure equal representation [ 34 , 35 ]. Facilitators focus on supporting the group involved in coproduction, maintaining respectful interactions, empowering service users and carers, and addressing any tensions that may arise during the collaborative process [ 36 , 37 ].

In summary, senior leaders sponsor and support coproduction. Champions and ambassadors are individuals who advocate for and support coproduction initiatives, while project leaders and facilitators are responsible for managing and guiding coproduction projects themselves, thereby ensuring effective collaboration among stakeholders. All of these roles can be played by people drawn from various backgrounds, including senior staff, health care professionals, experts in coproduction, researchers, citizens, or volunteers.

Three models of leadership in coproduction

These actors play different leadership roles, and leadership can be exercised by individuals or groups. Three leadership models have been proposed: leadership as enacted by individual leaders, coleadership and collective leadership.

Leadership by individual leaders

A leader-centric view has been the dominant interpretation of leadership in the field of coproduction. Many references were made to “senior leaders”. This term was used to describe formal representatives of organizations or services (senior managers, executives), formally appointed community leaders (policy-makers, local government leaders), or respected leaders of communities. Senior support was described as an important success factor in coproduction [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. Other leadership roles included project leaders, facilitators, ambassadors, and champions – as described in the previous section.

Some papers referred to traits and characteristics exhibited by leaders that facilitate coproduction. These factors included innovativeness, personability, action orientation [ 46 ], courage [ 47 ], passion [ 32 , 46 ], and empathy [ 25 , 46 , 48 ]. “Strong leadership” was often mentioned, albeit without elaboration [ 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. By implication, “strong leadership” appeared to include providing clear direction and guidance, having a clear vision [ 53 ], holding onto a vision [ 34 ], and keeping the vision alive for the team [ 43 ].

Other researchers noted a more collaborative and democratic leadership style that is characterized by listening, transparency, deliberation, and nurturing coproductive behaviours [ 27 , 30 , 48 ]. Senior leaders could use a “top-down” approach to promote user involvement. Alternatively, they could “learn to manage horizontally not top down; embrace ground up initiatives; [and] aim to empower partners” [ 32 , 45 , 51 ] and be “open to changes that would disturb traditional relationships and power disparities between service users and providers” [ 41 ]. Respondents to a survey of participants in a peer-led support network favoured a traditional directive model of leadership alongside a more facilitative and enabling style [ 56 ]. However, they found it challenging to transition to a more distributed and collective leadership approach.

Co-leadership

The terms “co-lead”, “co-leadership” and “dual leadership” refer to situations in which a formal leadership role is allocated to more than one person, in which context the relevant people may represent different institutions or different groups, e.g., different professional groups, researchers and service users/citizens, or teachers and students [ 28 , 31 , 40 , 41 , 57 , 58 ]. Coleads were defined as “individuals who led and made joint decisions” [ 59 ]. Some papers explored the leadership role of service users or community members in the coproduction of research related to health or wellbeing [ 35 , 60 , 61 ]. In these studies, areas of research were proposed by patients/community members, who then collaborated with academic researchers, thereby playing an equal or leading role. Coleadership was reported to result in shared learning.

Collective leadership

Few discernible differences among “ shared”, “distributed” and “collective” leadership were found in the papers included in this review. The approaches examined in this context were characterized by distributed roles and responsibilities in which different individuals’ skills and expertise were identified as best suited to the task at hand. Shared leadership depends on willingness on the part of leaders (implicitly non-community leaders) to be challenged and directed by community members rather than rigidly maintaining their previous conceptions of the issues and the appropriate means of addressing them [ 36 ].

Ward, De Brún, Beirne, Conway, Cunningham, English, Fitzsimons, Furlong, Kane and Kelly [ 62 ] referred to collective leadership as an emergent and dynamic team phenomenon. Other authors argued for a more structured approach to shared leadership [ 36 , 41 ] or distributed leadership [ 28 , 42 , 56 , 59 , 63 ]. Such an approach could involve allocating specific roles to service users, engaging them in a formal structure and/or enabling them to set an agenda [ 41 ], specifying shared roles and responsibilities [ 36 ], and/or providing dedicated support to lay “champions” in research studies [ 28 ]. Various benefits were attributed to collective leadership, such as empowering people to speak up [ 36 , 51 ] and feel engaged.

Nine practices associated with leading coproduction

We identified nine processes that encompass wide-ranging activities and interactions between individuals and groups with regard to leading the coproduction of health and wellbeing. As Farr noted, “Coproduction and codesign […] involves facilitating, managing and co-ordinating a complex set of psychological, social, cultural and institutional interactions” [ 64 ]. In some cases, these processes naturally align with certain actors—for instance, senior leaders play key roles in the tasks of initiating coproduction and implementing and sustaining its results—but other processes (championing coproduction, establishing trusting relationships, and ensuring good communication) are applicable to any and all participants in the coproduction process. Similarly, some of these practices occur at particular timepoints in a coproduction arc (namely, during the stages of initiation or implementation), while others can occur at any or all timepoints (i.e., during the assimilation stage or beyond). Deliberately considering the most suitable leadership model with regard to the aims and context of an initiative is useful at the start, but reflecting on the operation and appropriateness of the model is always salient.

Initiating coproduction

The initiation of coproduction entails recognizing the need for coproduction, dedicating resources, inviting and establishing relevant multi-stakeholder coproduction networks, and coproducing a vision and goals.

It has been argued that senior leaders act as gatekeepers for coproduction because they must recognize the need for it [ 45 ]. Senior leaders play a role in the task of determining the extent to which communities are given the opportunity to influence service design and integration [ 38 , 51 ]. Coproduction requires resources (principally time and money but also networks), which can be used to take advantage of other resources such as skills [ 29 , 31 , 34 , 40 ]. Senior leaders often control or provide access to such resources, which means that they are best positioned to initiate coproduction initiatives [ 41 , 65 ]. However, the findings of a cross-national study on the coproduction of policy showed that, in practice, senior leaders’ control over resources meant that they tended to define the means, methods and forms of participation [ 65 ].

In the task of establishing a conducive environment for coproduction, it is important to pay attention to which actors (organizations or individuals) are participating in the process [ 33 , 42 , 64 , 66 ] and to factors that may delimit those participants or their involvement [ 36 , 42 , 67 ]. Several papers emphasized the need to ensure that all stakeholders are involved from the outset [ 37 , 38 , 41 , 48 , 51 ]. In the initiation stages, a shared vision should be created [ 36 , 61 , 68 ], goals should be coproduced, and responsibilities should be clearly allocated [ 65 ]. Role clarity, ability, and motivation have been identified as determinants of coproductive behaviour, and leaders must implement arrangements to achieve these goals for coproducers [ 69 ].

Power sharing

It has been argued that coproduction leadership must attend to issues pertaining to power redistribution [ 60 , 61 , 63 , 64 ] and uphold the ideology of coproduction by promoting the values of democracy and transparency [ 30 , 32 , 70 , 71 , 72 , 73 , 74 ]. This process can occur at different levels.

At the macro system level, several cultural shifts have been implicated in the redistribution of power – a shift in current professional and stakeholder identities; more fluid, flattened and consensus-based ways of working; and a willingness to accommodate ‘messy’ issues [ 75 ]. The last of those issues was highlighted by Hopkins, Foster and Nikitin [ 29 , s 192], who suggested that coproduction requires service providers to “sit more easily with the unknown, to be comfortable in not having all the answers.” Similarly, “The challenge is that to be transformative, power must be shared with health service users. To do this entails building new relationships and fostering a new culture in health-care institutions that is supportive of participatory approaches” [ 42 , p 379].

At the meso level, several practices could be used to share power. Greenhalgh, Jackson, Shaw and Janamian [ 30 ] identified the importance of equitable decision-making practices and “evenly distributed power constellations.” This goal can be achieved, for instance, by ensuring that service users represent a majority on the project management committee or in codesign events with the goal of challenging dominant professional structures and discourses [ 37 ]. Other scholars called for clear roles and responsibilities [ 38 , 59 , 65 ]. Mulvale, Moll, Miatello, Robert, Larkin, Palmer, Powell, Gable and Girling [ 36 ] recommended the establishment of shared roles and responsibilities, the creation of a representative expert panel to resolve stalemates, and possibly the implementation of formal agreements regarding data and reporting. Importantly, however, Greenhalgh, Jackson, Shaw and Janamian [ 30 ] noted that governance structures and processes alone do not automatically overcome the subtle and inconspicuous uses of power. Farr [ 64 ] recommended the constant practice of critical reflection and dialogue and posed several questions for participants to consider: who is involved, what the interactions are like, how coproduction efforts are implemented within and across structures, and what changes are made.

Although sharing power has been described as an essential component in coproduction, the involvement of stakeholders does not necessarily entail empowerment [ 47 ], and case studies have demonstrated that service improvement initiatives that involve citizens or service users can be instrumental and effective with regard to improving services without enhancing or sharing power or political consciousness if stakeholders are invited but power is not shared [ 32 ]. Farr [ 64 ] noted that rather than coproduction being inherently emancipatory, coproduction and codesign processes can have either dominating or emancipatory effects [ 33 ], and the exclusion of vulnerable groups from coproduction has the potential to reinforce existing inequities [ 75 ].

Training and development for emerging leadership

The importance of appropriate training and mutual learning was noted in several papers [ 36 , 42 , 48 , 63 , 69 , 76 , 77 ]. Implicitly, training for professionals was framed in terms of training in the process of sharing power with service users or facilitating collaboration, whereas training for service users was framed as capacity-building in terms of collaboration and/or leadership. In one case study focusing on coproduced research, participants rejected the notion of “training” from academic researchers with the aim of avoiding suggesting that a certain level of “expertise” needed to be transferred [ 60 ].

Playing a leadership role can be empowering [ 51 , 71 ], but for some individuals, it can be overwhelming [ 71 ]. Leading coproduction requires practice and the development of skills and capacities [ 26 , 48 ]. In some initiatives, lay partners were initially involved in limited roles and gradually took on more responsible leadership tasks over time [ 28 , 42 , 78 ]. In addition, community members’ level of involvement was flexible—they could be participants or take on additional roles as volunteers, paid staff members or directors of organizations. This flexibility offered participants the opportunity to "begin sharing, as opposed to shouldering, the burden of involvement” [ 71 ].

The provision of support

Support is necessary throughout the coproduction process from its outset to the stages of implementation and sustainment [ 25 , 34 , 68 ]. Key dimensions of support include facilitating, advocating for, and championing coproduction. Project management is instrumental to the smooth operation and facilitation of coproduction [ 34 , 35 , 37 , 44 ]. Several facilitation activities are conducted by project leaders and facilitators [ 41 , 42 , 59 , 61 , 78 ]. These activities include holding onto a vision and keeping it alive for the team, ensuring that the project remains on track, and helping maintain momentum. In one codesign case study, facilitators helped people focus on quick wins with the goal of maintaining motivation and engagement; they "needed to support movement from inaction to action, by sifting through group ideas to fix a plan" [ 34 ]. Although these authors acknowledged that this approach may have limited coproduction, they argued that such initiatives would not be sustainable if they were perceived to be “unfeasible.”

Another key function entails advocating for and championing coproduction initiatives to ensure that the process remains ongoing [ 25 , 28 , 29 , 30 , 31 , 32 , 37 , 41 , 74 , 79 ]. Senior leaders play an important role in the task of championing coproduction, and their support has often been described as an important success factor [ 34 , 38 , 39 , 43 , 80 ]. However, effective champions could equally include health care professionals [ 37 ], experts in coproduction [ 51 ], researchers [ 35 , 60 , 61 ], volunteers [ 51 ] or other citizens [ 41 , 61 ]. Champions with lived experience can gain the confidence of their peers and help create understanding among service providers [ 28 , 36 ].

Establishing trusting relationships

Coproduction is essentially relational and requires concerted efforts to establish trusting relationships and a sense of commitment. The importance of trust among stakeholders in coproduction has been noted in several papers [ 28 , 30 , 36 , 37 , 38 , 46 , 48 , 64 , 74 , 81 , 82 ]. In the field of health research, it is difficult to secure funding for the process of establishing relationships and working in the context of partnerships during the early stages of development [ 25 ]. It can therefore be helpful to base recruitment for coproduction initiatives on pre-existing trusting relationships [ 36 ]. If such pre-existing trusting relationships do not exist, policy-makers and senior leaders play a role in the creation of frameworks that can facilitate the development of trust both among organizations and between organizations and citizens, such as political and bureaucratic commitment on the part of regional and local governments and the engagement of actors who play a “boundary-spanning” role in the relationships between service providers, non-government organizations and communities [ 38 ]. Trust is established based on clear responsibilities [ 38 ] and adherence to the principles of engagement in coproduction. In addition to these frameworks, individual leaders must develop trust through interactions with coproducers, using collaborative skills such as those pertaining to communication and listening [ 48 ]. In one case study, through the frank sharing of the organizational, financial, and governance challenges and opportunities faced by stakeholders, people reached a growing understanding and appreciation of each other’s positions, which engendered trust [ 30 ]. Mulvale, Moll, Miatello, Robert, Larkin, Palmer, Powell, Gable [ 36 ] highlighted the importance of understanding and responding to participants’ histories, contexts, and cultural differences.

Commitment can be viewed as more important than resources [ 59 ]. The commitment to and engagement in coproduction exhibited by an organization’s senior leaders demonstrate organizational commitment and lend credibility to coproduction initiatives [ 25 , 34 , 38 , 41 , 47 , 59 , 80 , 83 ]. On some occasions, coproduction initiatives are reported to senior leaders, while on other occasions, the senior leaders were part of the coproduction team. Senior leaders who adopt a more hands-on approach serve as role models [ 25 ], advocating for patient engagement and engendering commitment on the part of staff and patients [ 28 ]. In public health initiatives, buy-in from community leaders confers legitimacy on innovations, helps ensure community trust [ 61 , 78 ], increases the engagement of community members [ 78 ] and is key to a project’s success [ 83 ].

Communication

Communication is a key activity in coproduction, and leaders must establish an environment that is conducive to “epistemological tolerance” [ 47 ], such that different perspectives are valued and appreciated. Such environments facilitate dialogue among partners [ 28 , 30 , 35 , 51 ] and allow critical voices to be heard [ 42 ] . Open dialogue among stakeholders is a starting point for the task of identifying the sources of assumptions and stereotypes, which is itself a prerequisite for change in attitudes and practice [ 28 ]. Project leaders must also facilitate accessible and transparent dialogue and ensure the equal representation of all stakeholders, including those who are less able to communicate verbally [ 57 , 71 ]. Professional leaders are responsible for critically reviewing their professional norms, organizational/institutional processes and past and present policies and practices [ 55 , 75 ].

Dealing with multiple stakeholders, which is inevitably required in coproduction, requires addressing multiple perspectives in an attempt to bring them together. This task frequently involves a degree of conflict and peace negotiation [ 30 , 34 , 41 , 48 , 61 , 64 ]. Leaders should be alert to conflict and power dynamics [ 34 , 36 ]. It may be necessary for meeting chairs to encourage participants to move on from their familiar, entrenched positions to avoid descending into circular arguments and stalemates (Chisholm et al. 2018). This task could require the injection of a critical voice, as Greenhalgh explained:

“Meeting chairs were selected for their leadership qualities, ability to identify and rise above “groupthink” (bland consensus was explicitly discouraged), and commitment to ensuring that potential challenges to new ideas were identified and vigorously discussed. They set an important ethos of constructive criticism and creative innovation, with the patient experience as the central focus. They recognized that if properly handled, conflict was not merely healthy and constructive, but an essential process in achieving successful change in a complex adaptive system. ” [ 30 ]

Leaders must acknowledge the facts that discomfort can arise when more equitable relationships are established [ 61 ] and that challenges to professional identity [ 84 ] and the loss of control [ 72 ] are factors in this process.

Networking refers to the practice of establishing and maintaining relationships with various stakeholders both within and outside the coproduction initiative. Since coproduction involves working with different stakeholders in networks, several papers have discussed the vital mediating processes associated with this context.

“Bridging, brokering and boundary spanning roles have a key role in cross fertilization of ideas between groups, for generating new ideas and for increasing understanding and cooperation” [ 32 , 53 ].

In policy-making, it is helpful to develop coordination structures and processes such as cross-sector working groups and committees, intersector communication channels [ 65 ], and relationship and dialogue structures [ 42 ]. Community representatives can play a mediating role between individuals and public organizations and may alleviate professionals’ concerns regarding the transaction costs of coproduction in the planning and management of services [ 26 , 81 ]. However, these representatives may or may not use this power to amplify the voices of individual coproducers [ 81 ].

An important role of project leaders is that of the “broker” [ 32 , 85 ], who focuses on mediating among different stakeholders in an attempt to align their perspectives [ 26 ,  37 ,  72 , 86 ]. Another role focuses on spanning the boundaries across sites [ 50 ], between local service providers [ 68 ], or among local services, non-government organizations and the community [ 38 ]. Bovaird, drawing on a number of cases of coproduction, came to the following conclusion:

“ there is a need for a new type of public service professional: the coproduction development officer, who can help to overcome the reluctance of many professionals to share power with users and their communities and who can act internally in organizations (and partnerships) to broker new roles for coproduction between traditional service professionals, service managers, and the political decision-makers who shape the strategic direction of the service system.” [ 81 ]

Orchestration

This practice involves reflecting on and improving coproduction itself. It includes activities such as evaluating the effectiveness of coproduction efforts, assessing the impact of coproduction on outcomes, and making adjustments to improve the coproduction process. Several papers have addressed the roles of local government or public managers or health professionals in overseeing and (as we refer to this process) ‘orchestrating’ the networks involved in coproduction at the community or local government level [ 30 , 33 , 65 , 74 , 87 ]. Orchestration involves recruiting the appropriate actors as noted above as well as directing and coordinating activities, thereby ensuring that the whole is more than the sum of its parts. As part of their orchestration work, leaders play a role in the task of managing risk in service innovation [ 55 , 87 ] and must commit to self-reflexivity and a critical review of norms, policies and practices to alert themselves to any unintended negative consequences and strive to counteract them [ 55 ]. Sturmberg, Martin and O’Halloran [ 88 ] used the metaphor of ‘conducting’ to describe the function of leadership in health care – i.e., leading the orchestra through inspiration and empowerment rather than control, leading to the provision of feedback as the performance unfolds.

From a public service perspective, Powers and Thompson [ 69 ] argued that coproduction requires the leader (“usually a public official”) to mobilize the community on behalf of the public good, organize the provision of the good, create incentives, and supervise the enforcement of community norms. Sancino [ 74 ] argued that local governments play a ‘meta-coproduction role’ that requires them to maximize the coproduction and peer-production of community outcomes by taking into account community contributions and deciding which services should be commissioned or decommissioned (a point that was also made by Wilson [ 87 ]) and to promote coproduction and peer-production in such a way as to promote the coproduction of outcomes that have been decided through a democratic process. In this way, he argued,

"the local government becomes the pivot of different kinds of relationships and networks made up of different actors who collectively assume the responsibility for implementing an overall strategic plan of the community beyond their specific roles and interests." [ 74 ]

Sancino [ 74 ] attempted to draw out the leadership implications of this situation, arguing that rather than focusing on service delivery, public managers must create appropriate conditions for such meta-coproduction. This task entails a directing role based on framing shared scenarios for change in the community through sense-making; an activator role based on activating, mobilizing and consolidating the social capital of the community to promote diffused public leadership; a convenor role based on serving as a meta-manager in the process of self-organizing the knowledge, resources and competencies pertaining to the community in question; and an empowering role based on creating conditions in which peer production and coproduction can be combined to create the corresponding added value (i.e., higher levels of community outcomes) [ 74 ]. This practice essentially focuses on self-assessment and continuous improvement within the coproduction framework.

Implementation

It has been argued that coproduction in services [ 30 , 79 ] or policy-making [ 65 ] may improve implementation. The role of leadership in supporting the implementation of the outcomes of coproduction is essential [ 37 , 41 , 49 , 52 , 64 , 65 , 85 , 86 ]. Leaders can argue for the legitimacy of coproduced innovations [ 89 ] and implement mechanisms aimed at acting on the issues thus raised and continuing to promote patients’ involvement [ 28 , 41 ]. Implementing the outcomes of coproduction relies on outcome-focused leadership [ 30 ]. The results of coproduction initiatives must be transformed into strategic plans and policies [ 41 ], and patient perspectives must be translated into actionable quality improvement initiatives [ 49 ]. Conversely, implementation can be blocked by leaders who fail to respond to the results of coproduction initiatives or who implement policies or procedures that are poorly aligned with the recommendations arising from coproduction [ 30 , 41 ]. It should also be acknowledged that not all demands thus generated can always be met [ 61 ]. Failures of implementation run the risk of stakeholder disillusionment; thus, the management of expectations is important.

A framework for coproduction leadership

When coproduction is initiated, it is possible to consider the actors involved and to imagine various forms of coproduction. In the design process, it is possible to make a deliberate choice with regard to the most appropriate model of leadership, and depending on the leadership model selected (leader-centric, coleadership, or collective leadership), different leadership practices emerge. The nine leadership practices identified can be enacted by different people and in different ways. The leadership of coproduction that thus emerges is shaped by issues such as the model of coproduction, the stakeholders involved, participants’ motivations and the context of coproduction. A main concern lies in the need to design project structures and work practices that are aligned and that enable leadership to emerge. We thus created a table (Table  1 ) that illustrates potential reflective questions in this context.

This discussion highlights and problematizes the two main findings of this systematic review, namely, the need to deliberately consider underlying models of leadership and the complex character of leading coproduction.

The need for the deliberate use of leadership in the plural

A focus on leader-centric approaches and the quality of leaders has characterized public leadership research [ 90 ]. Such a focus is echoed in our findings on coproduction leadership, first with regard to the prominence of senior leaders and, to a lesser extent, facilitators. Politicians were rarely identified in the papers included in our review despite representing some of the main actors identified in a previous review [ 4 , 91 ]. Second, many papers referenced the need for “strong” leaders, and the skills and behaviours of individual leaders were noted. As other researchers have found, despite the focus of this field on relationships and interactions, its emphasis has frequently remained on the individual leader and their ability to engage and inspire followers [ 13 ]. Furthermore, even in papers that emphasized ‘coleadership’ or ‘collective leadership,’ the focus remained on public managers, service managers and facilitators. Very little evidence has been reported concerning individual service users’ or citizens’ leadership of (as distinct from involvement in ) coproduction. Although the involvement of community leaders was reported to play a role in project success, no articles explored this issue.

However, some important exceptions should be noted. For example, some studies exhibited a preference for mixed models, employing both a directive approach (particularly in the beginning) and a more facilitative and distributed leadership approach [ 56 ]. Rycroft-Malone, Burton, Wilkinson, Harvey, McCormack, Baker, Dopson, Graham, Staniszewska and Thompson [ 53 ] concluded that consideration should be given to models that combine hierarchical, directive structures with distributed facilitative forms of leadership.

One explanation for this rather narrow view of leadership is that despite the rapidly increasing number of publications in the general field of coproduction [ 7 , 18 ], empirical studies have still lacked depth with regard to investigations of the leadership of this process. Most empirical studies included in this review mentioned leadership only in passing or derived some conclusions regarding leadership from case studies focusing on other aspects of the coproduction process.

Another explanation for this situation is that although coproduction focuses on partnership, in most cases, senior leaders have control over resources and the power to define the means, methods, extent and forms of participation [ 65 ]. Even shared leadership models seem to rely on traditional leaders’ willingness to share power [ 10 ], as leaders are the actors who invite, facilitate, and support the participation of coleaders. However, some signs of change towards a broader view should be noted. Recent publications have theorized the leadership of coproduction and included case studies that have demonstrated leadership to be a social, collective and relational phenomenon that emerges as a property of interactions among individuals in given contexts [ 13 , 19 ].

The complexity of coproduction leadership practices

Our findings indicate that the leadership of coproduction practices entails challenging and complex tasks. Complexity emerges in cases in which many parts are interrelated in multiple ways. Different kinds of leadership activities may be necessary depending on the stakeholders involved [ 92 ], the context [ 13 ], and the mode, level, and phase of coproduction [ 93 ]. A complexity perspective based on systems thinking is therefore useful [ 13 , 19 ]. All actors involved in coproduction are potential leaders, but for that potential to be realized, the coproduction initiative and its leadership must be framed and comprehended in a more plural way. A recent study on systems thinking and complex adaptive thinking as means of initiating coproduction advocated a collective leadership approach [ 19 ].

Our findings highlight the need for a complex way of making meaning of leadership throughout the coproduction process, such as the ability to be flexible due to circumstances and employ both strong leadership and more facilitative approaches when necessary. Leaders must also promote the values of democracy, transparency and the redistribution of power among stakeholders throughout the process [ 64 , 94 ]. These practices and tasks are complex, which must be matched by an inner mental complexity [ 95 , 96 ]. Several practices identified in this research, such as genuinely valuing diverse perspectives, promoting mutual transformative power sharing and welcoming conflicts, require a complex mode of meaning-making that results from psychological development. These issues warrant further exploration. Future studies featuring a thoughtful choice of leadership and complexity models as well as a broader methodological repertoire are thus necessary (see Table  2 for an overview).

Methodological strengths and limitations

A strength of this review lies in its integration of research on the sparse and overlooked issue of leadership in coproduction. Our search strategy, which involved using the key words manag* and lead*, may have excluded some relevant papers. To verify that this approach did not represent an excessively blunt exclusion criterion, we checked 10% of the articles that were excluded based on this criterion. All of these articles would also have been excluded for failing to include any exploration of the management or leadership of coproduction. We therefore determined that this exclusion criterion was justifiable. Many papers did not have an explicit focus on leadership; however, by synthesizing the data, all data were treated as reflections that jointly created a larger pattern, similar to a kaleidoscope. The exclusion of non-peer-reviewed papers is likely to have led to the exclusion of coproduced outputs, which may have offered important insights into the leadership of coproduction, particularly with regard to the experiences of service users and citizens playing leadership roles. In the reporting of this review, the PRISMA guidelines were followed (Additional file 2 ). It should be noted that the lack of reporting bias assessment and certainty assessment represents a limitation of this study.

Future research

Future research (see Table  2 ) should focus on under-represented roles, such as those of politicians and community leaders, and explore emerging collective leadership models based on real-time observational studies. It should also investigate the balance between strong and shared leadership by using qualitative and participatory research methods. Incorporating systems thinking and relevant leadership models can offer new perspectives on collective leadership practices.

Practical implications

This paper explored coproduction leadership practices and revealed that they require a deliberate and plural understanding of leadership roles and tasks. We proposed a framework for coproduction leadership that takes into account the actors involved, the models of leadership, and the leadership practices that emerge in different contexts and during different phases of coproduction. We also provided a set of reflective considerations that can help all actors involved in this process make more deliberate choices regarding the parties involved, leadership models of coproduction, and practices (Table  1 ).

Our systematic review revealed some gaps in the literature on coproduction leadership, such as the lack of attention to the mental complexity of coproduction leaders, the under-representation of service users and citizens as leaders, and the need for more empirical studies that use appropriate models and methods to capture the complexity of coproduction leadership. We suggest that future research should address these gaps, thus contributing to the advancement of coproduction theory and practice.

Our framework also has some practical implications for coproduction leaders and participants. At the start of coproduction process, all people, particularly leaders, must learn more about different models of leadership and how power is shared. Throughout this process, flexibility is necessary because leadership constellations change over time; they emerge and fade away, thus implying different underlying leadership models. A multitude of practices must be implemented throughout the coproduction process. People in leader roles must be aware of their personal strengths and limitations, not only with the goal of sharing leadership but also with the aim of establishing partnerships with others who have competence in certain practices, such as facilitation or addressing conflicts. Reflecting upon the guiding questions can also help illustrate the extent to which power and leadership are being shared. In conclusion, to create more equal power relations over time, we must challenge our current practices and work deliberately to enhance the capacity of individuals and groups to effectively engage in coproduction leadership.

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Acknowledgements

The authors wish to thank Forte, the Swedish Research Council for Health, Working Life and Welfare. In particular, we would like to thank Mary McCall for valuable help.

Open access funding provided by Jönköping University. The study of Samskapa, a coproduction research programme, received funding from Forte, the Swedish Research Council for Health, Working Life and Welfare, under grant agreement no. 2018–01431.

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SK and SS performed the data extraction, qualitative synthesis and drafted the manuscript and Table 1 . SK finalized the manuscript. D.M. screened the data from a previous scoping review, provided the search strategy (Additional file 1 : Appendix 1) and constructed the Prisma flowchart. SS compiled sample description in Additional file 2 : Appendix 2. All authors reviewed and approved the manuscript and agreed to be accountable for all aspects of the work.

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Additional file 2: Appendix 2. 

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Kjellström, S., Sarre, S. & Masterson, D. The complexity of leadership in coproduction practices: a guiding framework based on a systematic literature review. BMC Health Serv Res 24 , 219 (2024). https://doi.org/10.1186/s12913-024-10549-4

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Reemployment Services Evidence: A Collection of Briefs on RESEA Components (Compendium of Issue Briefs on Literature Review Findings)

Publication info, research methodology, country, state or territory, description, other products.

In 2018, amendments to Section 306(c) of the Social Security Act (SSA) permanently authorized the Reemployment Services and Eligibility Assessments (RESEA) program and introduced substantive changes, including formula-based funding to states and a series of requirements intended to increase the use and availability of evidence-based reemployment interventions and strategies. The Department of Labor provides funding to states to operate the RESEA program, which aims to help Unemployment Insurance (UI) claimants return to work quickly and meet eligibility requirements.

The evaluation of the RESEA program includes four major components: 1) an implementation report; 2) a brief on serving UI claimants during the COVID-19 pandemic; 3) a collection of evidence briefs about RESEA program components, including selecting claimants and meeting attendance, basic career services, and individualized services; and 4) a report on options for building evidence on RESEA programs. This collection of evidence briefs aims to inform states about the status of evidence on RESEA programs and strategies. The briefs examine the evidence and gaps in three subject areas: 1) program activities that precede the in-person RESEA meeting--claimant selection, scheduling, and attendance policies; 2) impacts of basic career services; and 3) impacts of individualized career services.

Nearly all completed impact evaluations estimate the effectiveness of whole RESEA programs, not components of those programs. Findings from the evidence briefs indicate that:

Available evidence on selection criteria comes from whole-program impact studies that test for differential impacts across subgroups of claimants. While programs often select claimants with statistical models that predict the likelihood of benefit exhaustion, evidence suggests that impacts usually do not vary with the scores from those models. Prior research suggests that other UI claimant characteristics, such as the weekly benefit amount, may better predict program impact.

One impact study finds that an emphasis on clear and concise communication may improve program attendance rates, but most analyses of approaches to improve program attendance are descriptive. Scheduling and communication strategies have rarely been tested rigorously, and additional research could increase the knowledge base of the effects of self-scheduling, alternative communication channels, and non-compliance policies on attendance.

Reemployment programs for UI claimants sometimes require program participation, and mandatory participation appears to be relevant to program impacts. Few studies have isolated the effect of reemployment services from the requirement to participate and these requirements may need further study.

RESEA programs include a combination of career development and employment-related services. States may be interested in the available evidence for specific services or groups of career services. The briefs review the evidence for basic and individualized career services separately; however, previous studies generally have not isolated the effects of these types of services.

Reemployment services, particularly when evaluated separately, can be expected to have small impacts when compared to a control group. As a result, state evaluations of low-intensity components will often require large samples.

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Title: research and application of transformer based anomaly detection model: a literature review.

Abstract: Transformer, as one of the most advanced neural network models in Natural Language Processing (NLP), exhibits diverse applications in the field of anomaly detection. To inspire research on Transformer-based anomaly detection, this review offers a fresh perspective on the concept of anomaly detection. We explore the current challenges of anomaly detection and provide detailed insights into the operating principles of Transformer and its variants in anomaly detection tasks. Additionally, we delineate various application scenarios for Transformer-based anomaly detection models and discuss the datasets and evaluation metrics employed. Furthermore, this review highlights the key challenges in Transformer-based anomaly detection research and conducts a comprehensive analysis of future research trends in this domain. The review includes an extensive compilation of over 100 core references related to Transformer-based anomaly detection. To the best of our knowledge, this is the first comprehensive review that focuses on the research related to Transformer in the context of anomaly detection. We hope that this paper can provide detailed technical information to researchers interested in Transformer-based anomaly detection tasks.

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  27. The complexity of leadership in coproduction practices: a guiding

    This systematic literature review is based on a study protocol on coproduction research in the context of health and social care sectors [], and data were obtained from a published scoping review, where the full search strategy is provided [].The scoping review set out to identify 'what is out there' and to explore the definitions of the concepts of coproduction and codesign.

  28. Reemployment Services Evidence: A Collection of Briefs on RESEA

    In 2018, amendments to Section 306(c) of the Social Security Act (SSA) permanently authorized the Reemployment Services and Eligibility Assessments (RESEA) program and introduced substantive changes, including formula-based funding to states and a series of requirements intended to increase the use and availability of evidence-based reemployment interventions and strategies. The Department of ...

  29. [2402.08975] Research and application of Transformer based anomaly

    Transformer, as one of the most advanced neural network models in Natural Language Processing (NLP), exhibits diverse applications in the field of anomaly detection. To inspire research on Transformer-based anomaly detection, this review offers a fresh perspective on the concept of anomaly detection. We explore the current challenges of anomaly detection and provide detailed insights into the ...