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COMMUNICATION IN THE BIOLOGICAL SCIENCES Department of Biology

LITERATURE REVIEW PAPER

WHAT IS A REVIEW PAPER?

CHOOSING A TOPIC

RESEARCHING A TOPIC

HOW TO WRITE THE PAPER    

The purpose of a review paper is to succinctly review recent progress in a particular topic. Overall, the paper summarizes the current state of knowledge of the topic. It creates an understanding of the topic for the reader by discussing the findings presented in recent research papers .

A review paper is not a "term paper" or book report . It is not merely a report on some references you found. Instead, a review paper synthesizes the results from several primary literature papers to produce a coherent argument about a topic or focused description of a field.

Examples of scientific reviews can be found in:

                Current Opinion in Cell Biology

                Current Opinion in Genetics & Development

                Annual Review of Plant Physiology and Plant Molecular Biology

                Annual Review of Physiology

                Trends in Ecology & Evolution

You should read articles from one or more of these sources to get examples of how your paper should be organized.

Scientists commonly use reviews to communicate with each other and the general public. There are a wide variety of review styles from ones aimed at a general audience (e.g., Scientific American ) to those directed at biologists within a particular subdiscipline (e.g., Annual Review of Physiology ).

A key aspect of a review paper is that it provides the evidence for a particular point of view in a field. Thus, a large focus of your paper should be a description of the data that support or refute that point of view. In addition, you should inform the reader of the experimental techniques that were used to generate the data.

The emphasis of a review paper is interpreting the primary literature on the subject.  You need to read several original research articles on the same topic and make your own conclusions about the meanings of those papers.

Click here for advice on choosing a topic.  

Click here for advice on doing research on your topic.  

HOW TO WRITE THE PAPER

Overview of the Paper: Your paper should consist of four general sections:

Review articles contain neither a materials and methods section nor an abstract.

Organizing the Paper: Use topic headings. Do not use a topic heading that reads, "Body of the paper." Instead the topic headings should refer to the actual concepts or ideas covered in that section.

Example  

What Goes into Each Section:

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What is a review article?

Learn how to write a review article.

What is a review article? A review article can also be called a literature review, or a review of literature. It is a survey of previously published research on a topic. It should give an overview of current thinking on the topic. And, unlike an original research article, it will not present new experimental results.

Writing a review of literature is to provide a critical evaluation of the data available from existing studies. Review articles can identify potential research areas to explore next, and sometimes they will draw new conclusions from the existing data.

Why write a review article?

To provide a comprehensive foundation on a topic.

To explain the current state of knowledge.

To identify gaps in existing studies for potential future research.

To highlight the main methodologies and research techniques.

Did you know? 

There are some journals that only publish review articles, and others that do not accept them.

Make sure you check the  aims and scope  of the journal you’d like to publish in to find out if it’s the right place for your review article.

How to write a review article

Below are 8 key items to consider when you begin writing your review article.

Check the journal’s aims and scope

Make sure you have read the aims and scope for the journal you are submitting to and follow them closely. Different journals accept different types of articles and not all will accept review articles, so it’s important to check this before you start writing.

Define your scope

Define the scope of your review article and the research question you’ll be answering, making sure your article contributes something new to the field. 

As award-winning author Angus Crake told us, you’ll also need to “define the scope of your review so that it is manageable, not too large or small; it may be necessary to focus on recent advances if the field is well established.” 

Finding sources to evaluate

When finding sources to evaluate, Angus Crake says it’s critical that you “use multiple search engines/databases so you don’t miss any important ones.” 

For finding studies for a systematic review in medical sciences,  read advice from NCBI . 

Writing your title, abstract and keywords

Spend time writing an effective title, abstract and keywords. This will help maximize the visibility of your article online, making sure the right readers find your research. Your title and abstract should be clear, concise, accurate, and informative. 

For more information and guidance on getting these right, read our guide to writing a good abstract and title  and our  researcher’s guide to search engine optimization . 

Introduce the topic

Does a literature review need an introduction? Yes, always start with an overview of the topic and give some context, explaining why a review of the topic is necessary. Gather research to inform your introduction and make it broad enough to reach out to a large audience of non-specialists. This will help maximize its wider relevance and impact. 

Don’t make your introduction too long. Divide the review into sections of a suitable length to allow key points to be identified more easily.

Include critical discussion

Make sure you present a critical discussion, not just a descriptive summary of the topic. If there is contradictory research in your area of focus, make sure to include an element of debate and present both sides of the argument. You can also use your review paper to resolve conflict between contradictory studies.

What researchers say

Angus Crake, researcher

As part of your conclusion, include making suggestions for future research on the topic. Focus on the goal to communicate what you understood and what unknowns still remains.

Use a critical friend

Always perform a final spell and grammar check of your article before submission. 

You may want to ask a critical friend or colleague to give their feedback before you submit. If English is not your first language, think about using a language-polishing service.

Find out more about how  Taylor & Francis Editing Services can help improve your manuscript before you submit.

What is the difference between a research article and a review article?

Before you submit your review article….

Complete this checklist before you submit your review article:

Have you checked the journal’s aims and scope?

Have you defined the scope of your article?

Did you use multiple search engines to find sources to evaluate?

Have you written a descriptive title and abstract using keywords?

Did you start with an overview of the topic?

Have you presented a critical discussion?

Have you included future suggestions for research in your conclusion?

Have you asked a friend to do a final spell and grammar check?

Expert help for your manuscript

Taylor & Francis Editing Services  offers a full range of pre-submission manuscript preparation services to help you improve the quality of your manuscript and submit with confidence.

Related resources

How to edit your paper

Writing a scientific literature review

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Q: What is the difference between a research paper and a review paper?

This is my first attempt at writing a scientific paper and I am thinking of writing a review article. I want to know what is the exact difference between a research paper and a review paper. Will a review paper be published by a good journal?

Asked on 21 Jan, 2015

A research paper is based on original research. The kind of research may vary depending on your field or the topic (experiments, survey, interview, questionnaire, etc.), but authors need to collect and analyze  raw data and conduct  an original study. The research paper will be based on the analysis and interpretation of this data.

A review article or review paper is based on other published articles. It does not report original research. Review articles generally summarize the existing literature on a topic in an attempt to explain the current state of understanding on the topic. Review articles can be of three kinds:

• A narrative review explains the existing knowledge on a topic based on all the published research available on the topic.
• A systematic review searches for the answer to a particular question in the existing scientific literature on a topic.
• A meta-analysis compares and combines the findings of previously published studies, usually to assess the effectiveness of an intervention or mode of treatment.

Review papers form valuable scientific literature as they summarize the findings of existing literature. So readers can form an idea about the existing knowledge on a topic without having to read all the published works in the field. Well-written review articles are popular, particularly in the field of medicine and healthcare. Most reputed journals publish review articles. However, you should check the website of the journal you wish to get published in to see if they accept such articles. If published in a good peer-reviewed journal, review articles often have a high impact and receive a lot of citations.

If you are new to writing research papers, I would recommend taking this course designed exclusively for early career researchers:  An in-depth academic publishing course for young researchers . 

Related reading:

• 5 differences between a research paper and a review paper  
• The complete guide to writing a brilliant research paper

Answered by Editage Insights on 30 Mar, 2017

• Upvote this Answer

what is the meaning of an overview article ? can we conseder it as a research paper or review one?

Answered by aicha aicha on 15 Nov, 2018

Hi everyone. I am a new here. I think that a research paper is a piece of academic writing based on its author's original research on a particular topic. It can be either a term paper, a masters thesis or a doctoral dissertation. And a review article is an article that summarizes the current state of understanding on a topic. 

Answered by nic faust on 28 Jan, 2019

its a nice one

Answered by parry roy on 09 May, 2019

Research paper   sometimes referred to as empirical or primary sources, report on original research. They will typically include sections such as an introduction, methods, results, and discussion. Review paper , sometimes called literature reviews or secondary sources, synthesize or analyze research already conducted in primary sources. They generally summarize the current state of research on a given topic.

Answered by Christian Baker on 30 Jul, 2019

Answered by Maria Smith on 28 Jan, 2020

A research paper is all about research and a review paper tells you about giving reviews.

Answered by Freddie Woods on 14 Oct, 2021

A research paper presents original findings or results from a study, while a review paper summarizes and analyzes existing research on a particular topic, providing an overview of the current state of knowledge.

Answered by Muskan Choudhary on 26 Jul, 2023

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Review Paper vs. Research Paper: Main Differences

Doing a paper is difficult, so learn the difference between a review paper vs. research paper, to determine which one is ideal for you.

A research paper and a review paper are two very specific types of papers. They have different motives, goals, and prerequisites. The elements found in research papers and review papers differ. The research paper is based on originality, therefore the paper takes into consideration the author’s original research, whereas the review paper is founded on an existing collection of knowledge. 

This article will walk you through the main differences between a review paper vs. research paper, allowing you to correctly determine which one is ideal for your work.

What is a review paper?

A review paper project tries to provide readers with an overview of an existing collection of knowledge by reviewing a book or an article and examining its content, structure, style, and statements. Reviews, such as peer reviews, can be used to examine and assess the work of other authors, rating the work by comparing it to the work of others. A review article is frequently written for a large readership, which is why it is usually brief. 

Review papers can be classified into three types:

• Narrative: a collection of and attempt to communicate all known information about a certain topic. It is based on research that has previously been completed and published. 
• Meta-analysis: a method of comparing and combining the findings of past research studies. It is done routinely to evaluate the efficacy of a particular initiative or method of treatment.
• Systematic: a search of all known scientific information on a topic to find a solution to a specific issue or problem. 

What is a research paper?

A research paper entails writing on research that has been performed by themselves, usually something new and done mostly from scratch since it has to be original research. It incorporates the research parameters, as well as the assessment, interpretation and important findings of the research. 

Writing a research paper involves several phases and different aspects, such as: selecting a topic, developing a hypothesis, conducting research, testing the hypothesis, drawing conclusions, and publishing a paper supporting or denying the hypothesis. 

Review paper vs. Research paper

Now that you have a basic understanding of both sorts of papers, it is time to compare and contrast the main differences between review paper vs. research paper.

These are the main differences, however, there may be others:

• A research paper is usually more detailed and thorough than a review paper.
• A research paper is usually peer-reviewed, but a review paper is not always.
• In general, a research paper is more formal than a review paper.
• A research paper’s tone is normally objective, but a review paper’s tone can be more subjective.
• A research paper is normally written in APA style, however, a review paper may be written in a different format.

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How to Write a Best Review Paper to Get More Citation

Review Paper Writing Guide

Table of contents

What is a review paper, difference between a review paper and research paper, 6 t ypes of review papers, purpose of review paper, criteria for good review paper, step-by-step systematic procedure to write a review paper, sample review article format.

Are you new to academia? Do you want to learn how to write a good review paper to get in-depth knowledge about your domain? you are at the right place. In this article, you will learn how to write the best review paper in a step-by-step systematic procedure with a sample review article format to get more Citation.

A review paper, also known as a literature review , is a thorough, analytical examination of previously published literature. It also provides an overview of current research works on a particular topic in chronological order.

• The main objective of writing a review paper is to evaluate the existing data or results, which can be done through analysis, modeling, classification, comparison, and summary.  
• Review papers can help to identify the research gaps, to explore potential areas in a particular field.
• It helps to come out with new conclusions from already published works.
• Any scholar or researcher or scientist who wants to carryout research on a specific theme, first read the review articles relevant to that research area to understand the research gap for arriving at the problem statement.
• Writing a review article provides clarity, novelty, and contribution to the area of research and it demands a great level of in-depth understanding of the subject and a well-structured arrangement of discussions and arguments.
• There are some journals that publish only review papers, and they do not accept research articles. It is important to check the journal submission guidelines.

The difference between a review paper and research paper is presented below.

The review papers are classified in to six main categories based on the theme and it is presented in the figure below.

The purpose of a review paper is to assess a particular research question, theoretical or practical approach which provides readers with in-depth knowledge and state-of-the-art understanding of the research area.

The purpose of the review paper can vary based on their specific type and research needs.

• Provide a unified, collective overview of the current state of knowledge on a specific research topic and provide an inclusive foundation on a research theme.
• Identify ambiguity, contradictions in existing results or data.
• Highlight the existing methodological approaches, research techniques, and unique perceptions.
• Develop theoretical outlines to resolve and work on published research.
• Discuss research gaps and future perspectives.

A good review paper needs to achieve three important criteria. ( Palmatier et al 2017 ).

• First, the area of research should be suitable for writing a review paper so that the author finds sufficient published literature.
• The review paper should be written with suitable literature, detailed discussion, sufficient data/results to support the interpretation, and persuasive language style.
• A completed review paper should provide substantial new innovative ideas to the readers based on the comparison of published works.

Review papers are widely read by many researchers and it helps to get more citations for author. So, it is important to learn how to write a review paper and find a journal to publish .

Time needed:  20 days and 7 hours

The systematic procedural steps to write a the best review paper as follows:

Select a suitable area in your research field and formulate clear objectives, and prepare the specific research hypotheses that are to be explored.

Designing your research work is an important step for any researcher. Based on the objectives, develop a clear methodology or protocol to review a review paper.

Thorough analysis and understanding of different published works help the author to identify suitable and relevant data/results which will be used to write the paper.

The degree of analysis to evaluate the collected data vary by extensive review. The examination of treads, patterns, ideas, comparisons, and relationships among the study provides deeper knowledge on that area of research .

Interpretation of results is very important for a good review paper. The author should present the discussion in a systematic manner without any ambiguity. The results can be presented in descriptive form, tables, and figures. The new insights should have an in-depth discussion of the topic in line with fundamentals. Finally, the author is expected to present the limitations of the existing study with future perspectives.

• Title, Abstract, Keywords

Write an effective and suitable title, abstract and keywords relevant to your review paper. This will maximize the visibility of your paper online for the readers to find your work. Your title and abstract should be clear, concise, appropriate, and informative.

• Introduction

Present a detailed introduction to your research which is published in chronological order in your own words. Don’t summarize the published literature. The introduction should encourage the readers to read your paper.

• Various topics to discuss the critical issues

Make sure you present a critical discussion, not a descriptive summary of the topic. If there is contradictory research in your area of research, verify to include an element of debate and present both sides of the argument. A good review paper can resolve the conflict between contradictory works.

• Conclusion and Future perspectives

The written review paper should achieve your objectives. Hence, the review paper should leave the reader with a clear understanding of following questions:

What they can understand from the review paper?

What still remains a requirement of further investigation in the research area?

This can include making suggestions for future scope on the theme as part of your conclusion.

• Acknowledgement       

The authors can submit a brief acknowledgement of any financial, instrumentation, and academic support received pertaining to research work.

Citing references at appropriate places in the article is necessary and important to avoid plagiarism. Each journal has its own referencing style. Therefore, the references need to be listed at the end of the manuscript. The number of references in the review paper is usually higher than in a research paper .

Hope this article would give you a clear idea on how to write a review paper. Please give your valuable comments.

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Reviewing a scientific paper - some guidelines

The aim of the review is to provide authors with constructive feedback from specialists, so that they can make improvements to their work. This is of key importance to ensure the highest possible standard.

Before you start

Make sure that you are familiar with the Instructions for Authors of the Journal. Before you decide to accept or decline the invitation to review, consider this:

• Is the paper within your area of expertise? If not, it may be difficult to provide a high quality review.
• Do you have any conflict of interest? For example, do any of the authors work at the same organization as you, or do you know any of them personally? If so, let the editor know.
• Make sure that you have the time. It is important to meet the deadlines.

Note that the paper sent to you for peer review is a privileged confidential document . This means that you cannot use the information obtained during the peer-review process for your own or any other person or organization’s advantage or to disadvantage or discredit others.

You should also not contact authors directly, this is to protect your anonymity as IWA Publishing does not share your identity with authors. Comments should only be submitted to the journal via the peer review system.

Do not allow your reviews to be influenced by the origins of a manuscript, by the nationality, religious or political beliefs, gender or other characteristics of the authors.

Two types of papers

Most papers are in one of these categories:

• Research Papers : these papers are fully documented, interpreted accounts of significant findings of original research.
• Review Papers : these are critical and comprehensive reviews that provide new insights or interpretation of a subject through thorough and systematic evaluation of available evidence. Note, that a review paper is more than a literature overview. It must contain an in-depth critical review of the literature. Therefore, such a review paper is expected to have at least one experienced senior researcher among the authors.

General criteria

Your review will help the editor decide whether or not to publish the article:

• Does the paper provide insight into an important issue?
• Does the paper tell a good story?
• Is the paper interesting for an international audience?
• Does the insight from the paper stimulate new, important questions?
• Is there a high probability that the paper will be read and cited by others?

Your comments in the review

• Remember that authors will welcome positive feedback as well as constructive criticism from you.
• Your comments for the “Editor only” will NOT be sent to the author.
• Comments that will be transmitted to the author(s) do NOT reveal your identity.
• When providing comments to the authors, please do not suggest that the authors include references to your own work in their article. We do not allow reviewers to instruct authors cite their work unless it seems to be critical for the improvement of the submission. Even then, we only allow reviewers to suggest one of their own papers.

Hint : use your own word processor and copy and paste your comments.

Getting started

Start with the following quick checklist before you consider the content in detail:

• Is the length of the paper within the limits of the journal?
• Is the paper commercial or does it market a particular product or method?
• Is the paper structured properly (abstract, keywords, material and methods, discussion, conclusions, references, etc.)

Abstract, introduction and conclusion

• Make sure that the abstract is informative, can stand alone and covers the content.
• A combination of the problem and the conclusions.
• Maximum length according to the Journal instructions.
• No figures or citations should be included here.
• 3-6 keywords. Should be descriptive. The title words should not be repeated here.

Introduction

 It should

• state the objective, the problem - the research question to be addressed,
• provide a concise background: why the work was done,
• quote literature only with direct bearing on the problem - not a textbook,
• state a hypothesis – a suggested solution to the problem.

Conclusions

• This is the “take-home message” of the paper. Should be short and concise.
• Must be possible to derive from the results and discussion.
• It is not a summary of the paper.
• No references.

Read the abstract, introduction and conclusions

• Is there a clear message?
• Having read the introduction – can you find out what the contribution of the paper is? Try to formulate the message in your own words. This can be used later in the reviewer summary.
• Do the perceptions or hypotheses in the introduction match the conclusions?
• You should be able to find this out within half an hour of reading. After this you will probably have a first impression of whether the paper is worth publishing or not. If you are still positive , then continue the review process. If you are negative , you can probably already explain why the paper is not worth publishing .

Detailed review

Materials and methods

• Experiments : are the experiments documented adequately? Have information about positive and/or negative controls, and the numbers of replicated experiments and/or samples been provided?
• Model derivations : is the process model derived properly? Is it already known?
• Results : are they presented so that you can easily see their significance? You may use a comment like: “ The paper would be significantly improved with the addition of more details about…”
• Are concentrations shown with believable accuracy - or are they shown with too many significant digits?
• Data analysis : have statistics been used in an appropriate way? Is the raw data presented in such a way that you can see if the statistical method is adequate? Is the data normally distributed so that standard deviations are motivated? Are outliers discussed?
• Figures : Can the figures explain the results? Are the figure captions informative?
• Tables : are all the inputs in the tables necessary to understand the message?
• You may add comments like “ Overall I do not think that this article contains enough robust data to evidence the statement made on page X, lines Y–Z.
• Note that the discussion section makes the paper scientific! Can the author explain and interpret the results? Can you relate the discussion to the hypotheses? You may write a comment like “ This discussion could be enlarged to explain…”
• Have the results been critiqued against the literature? Have any similarities and discrepancies with other published data been identified and accounted for?
• Can the conclusions be derived from the results and the discussions?

Check the references

• Have the author(s) done their homework with previous contributions?
• Compare the introduction with the reference list. Is it clearly indicated what is new in this paper?
• Are there both older and newer references?
• How many references? There ought to be 20-30 references in most cases.
• Are there any references that cannot be read by an English speaking reader? At most 1-2 references can be allowed (where appropriate) but should be queried.
• Is the author citing the original contribution or citing from a popular source?
• Make sure that the references cited in the text are included in the reference list and vice versa .
• Many authors do not have English as their mother tongue. The text does not have to be perfect English, but it has to be clear and understandable. You may add some comment like “ This paper would benefit from some closer proof reading. It includes numerous linguistic errors (e.g. agreement of verbs) that at times make it difficult to follow. I would suggest that it may be useful to engage a professional English language editor following a restructure of the paper.”
• Phrase your feedback appropriately and with due respect.
• You do not need to go through the language issues yourself.

Your recommendation

Ensure that your final evaluation corresponds to your answers in the review form questions; especially should you be considering major revision or rejection.

Your recommendation will almost surely be one of these:

• Reject (explain reason in your report)
• Accept without revision (remember that this is very unusual! Most papers can be improved in some way)
• Revise – either major or minor (explain the revision that is required, and inform the editor if you would accept to review the revised paper)
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How to write a review article?

In the medical sciences, the importance of review articles is rising. When clinicians want to update their knowledge and generate guidelines about a topic, they frequently use reviews as a starting point. The value of a review is associated with what has been done, what has been found and how these findings are presented. Before asking ‘how,’ the question of ‘why’ is more important when starting to write a review. The main and fundamental purpose of writing a review is to create a readable synthesis of the best resources available in the literature for an important research question or a current area of research. Although the idea of writing a review is attractive, it is important to spend time identifying the important questions. Good review methods are critical because they provide an unbiased point of view for the reader regarding the current literature. There is a consensus that a review should be written in a systematic fashion, a notion that is usually followed. In a systematic review with a focused question, the research methods must be clearly described. A ‘methodological filter’ is the best method for identifying the best working style for a research question, and this method reduces the workload when surveying the literature. An essential part of the review process is differentiating good research from bad and leaning on the results of the better studies. The ideal way to synthesize studies is to perform a meta-analysis. In conclusion, when writing a review, it is best to clearly focus on fixed ideas, to use a procedural and critical approach to the literature and to express your findings in an attractive way.

The importance of review articles in health sciences is increasing day by day. Clinicians frequently benefit from review articles to update their knowledge in their field of specialization, and use these articles as a starting point for formulating guidelines. [ 1 , 2 ] The institutions which provide financial support for further investigations resort to these reviews to reveal the need for these researches. [ 3 ] As is the case with all other researches, the value of a review article is related to what is achieved, what is found, and the way of communicating this information. A few studies have evaluated the quality of review articles. Murlow evaluated 50 review articles published in 1985, and 1986, and revealed that none of them had complied with clear-cut scientific criteria. [ 4 ] In 1996 an international group that analyzed articles, demonstrated the aspects of review articles, and meta-analyses that had not complied with scientific criteria, and elaborated QUOROM (QUality Of Reporting Of Meta-analyses) statement which focused on meta-analyses of randomized controlled studies. [ 5 ] Later on this guideline was updated, and named as PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses). [ 6 ]

Review articles are divided into 2 categories as narrative, and systematic reviews. Narrative reviews are written in an easily readable format, and allow consideration of the subject matter within a large spectrum. However in a systematic review, a very detailed, and comprehensive literature surveying is performed on the selected topic. [ 7 , 8 ] Since it is a result of a more detailed literature surveying with relatively lesser involvement of author’s bias, systematic reviews are considered as gold standard articles. Systematic reviews can be diivded into qualitative, and quantitative reviews. In both of them detailed literature surveying is performed. However in quantitative reviews, study data are collected, and statistically evaluated (ie. meta-analysis). [ 8 ]

Before inquring for the method of preparation of a review article, it is more logical to investigate the motivation behind writing the review article in question. The fundamental rationale of writing a review article is to make a readable synthesis of the best literature sources on an important research inquiry or a topic. This simple definition of a review article contains the following key elements:

• The question(s) to be dealt with
• Methods used to find out, and select the best quality researches so as to respond to these questions.
• To synthetize available, but quite different researches

For the specification of important questions to be answered, number of literature references to be consulted should be more or less determined. Discussions should be conducted with colleagues in the same area of interest, and time should be reserved for the solution of the problem(s). Though starting to write the review article promptly seems to be very alluring, the time you spend for the determination of important issues won’t be a waste of time. [ 9 ]

The PRISMA statement [ 6 ] elaborated to write a well-designed review articles contains a 27-item checklist ( Table 1 ). It will be reasonable to fulfill the requirements of these items during preparation of a review article or a meta-analysis. Thus preparation of a comprehensible article with a high-quality scientific content can be feasible.

PRISMA statement: A 27-item checklist

Contents and format

Important differences exist between systematic, and non-systematic reviews which especially arise from methodologies used in the description of the literature sources. A non-systematic review means use of articles collected for years with the recommendations of your colleagues, while systematic review is based on struggles to search for, and find the best possible researches which will respond to the questions predetermined at the start of the review.

Though a consensus has been reached about the systematic design of the review articles, studies revealed that most of them had not been written in a systematic format. McAlister et al. analyzed review articles in 6 medical journals, and disclosed that in less than one fourth of the review articles, methods of description, evaluation or synthesis of evidence had been provided, one third of them had focused on a clinical topic, and only half of them had provided quantitative data about the extend of the potential benefits. [ 10 ]

Use of proper methodologies in review articles is important in that readers assume an objective attitude towards updated information. We can confront two problems while we are using data from researches in order to answer certain questions. Firstly, we can be prejudiced during selection of research articles or these articles might be biased. To minimize this risk, methodologies used in our reviews should allow us to define, and use researches with minimal degree of bias. The second problem is that, most of the researches have been performed with small sample sizes. In statistical methods in meta-analyses, available researches are combined to increase the statistical power of the study. The problematic aspect of a non-systematic review is that our tendency to give biased responses to the questions, in other words we apt to select the studies with known or favourite results, rather than the best quality investigations among them.

As is the case with many research articles, general format of a systematic review on a single subject includes sections of Introduction, Methods, Results, and Discussion ( Table 2 ).

Structure of a systematic review

Preparation of the review article

Steps, and targets of constructing a good review article are listed in Table 3 . To write a good review article the items in Table 3 should be implemented step by step. [ 11 – 13 ]

Steps of a systematic review

The research question

It might be helpful to divide the research question into components. The most prevalently used format for questions related to the treatment is PICO (P - Patient, Problem or Population; I-Intervention; C-appropriate Comparisons, and O-Outcome measures) procedure. For example In female patients (P) with stress urinary incontinence, comparisons (C) between transobturator, and retropubic midurethral tension-free band surgery (I) as for patients’ satisfaction (O).

Finding Studies

In a systematic review on a focused question, methods of investigation used should be clearly specified.

Ideally, research methods, investigated databases, and key words should be described in the final report. Different databases are used dependent on the topic analyzed. In most of the clinical topics, Medline should be surveyed. However searching through Embase and CINAHL can be also appropriate.

While determining appropriate terms for surveying, PICO elements of the issue to be sought may guide the process. Since in general we are interested in more than one outcome, P, and I can be key elements. In this case we should think about synonyms of P, and I elements, and combine them with a conjunction AND.

One method which might alleviate the workload of surveying process is “methodological filter” which aims to find the best investigation method for each research question. A good example of this method can be found in PubMed interface of Medline. The Clinical Queries tool offers empirically developed filters for five different inquiries as guidelines for etiology, diagnosis, treatment, prognosis or clinical prediction.

Evaluation of the Quality of the Study

As an indispensable component of the review process is to discriminate good, and bad quality researches from each other, and the outcomes should be based on better qualified researches, as far as possible. To achieve this goal you should know the best possible evidence for each type of question The first component of the quality is its general planning/design of the study. General planning/design of a cohort study, a case series or normal study demonstrates variations.

A hierarchy of evidence for different research questions is presented in Table 4 . However this hierarchy is only a first step. After you find good quality research articles, you won’t need to read all the rest of other articles which saves you tons of time. [ 14 ]

Determination of levels of evidence based on the type of the research question

Formulating a Synthesis

Rarely all researches arrive at the same conclusion. In this case a solution should be found. However it is risky to make a decision based on the votes of absolute majority. Indeed, a well-performed large scale study, and a weakly designed one are weighed on the same scale. Therefore, ideally a meta-analysis should be performed to solve apparent differences. Ideally, first of all, one should be focused on the largest, and higher quality study, then other studies should be compared with this basic study.

Conclusions

In conclusion, during writing process of a review article, the procedures to be achieved can be indicated as follows: 1) Get rid of fixed ideas, and obsessions from your head, and view the subject from a large perspective. 2) Research articles in the literature should be approached with a methodological, and critical attitude and 3) finally data should be explained in an attractive way.

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

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

Published on January 2, 2023 by Shona McCombes . Revised on August 15, 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.

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.

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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.

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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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Review vs. Research Articles

How can you tell if you are looking at a research paper, review paper or a systematic review  examples and article characteristics are provided below to help you figure it out., research papers.

A research article describes a study that was performed by the article’s author(s). It explains the methodology of the study, such as how data was collected and analyzed, and clarifies what the results mean. Each step of the study is reported in detail so that other researchers can repeat the experiment.

To determine if a paper is a research article, examine its wording. Research articles describe actions taken by the researcher(s) during the experimental process. Look for statements like “we tested,” “I measured,” or “we investigated.” Research articles also describe the outcomes of studies. Check for phrases like “the study found” or “the results indicate.” Next, look closely at the formatting of the article. Research papers are divided into sections that occur in a particular order: abstract, introduction, methods, results, discussion, and references.

Let's take a closer look at this research paper by Bacon et al. published in the International Journal of Hypertension :

Review Papers

Review articles do not describe original research conducted by the author(s). Instead, they give an overview of a specific subject by examining previously published studies on the topic. The author searches for and selects studies on the subject and then tries to make sense of their findings. In particular, review articles look at whether the outcomes of the chosen studies are similar, and if they are not, attempt to explain the conflicting results. By interpreting the findings of previous studies, review articles are able to present the current knowledge and understanding of a specific topic.

Since review articles summarize the research on a particular topic, students should read them for background information before consulting detailed, technical research articles. Furthermore, review articles are a useful starting point for a research project because their reference lists can be used to find additional articles on the subject.

Let's take a closer look at this review paper by Bacon et al. published in Sports Medicine :

Systematic Review Papers

A systematic review is a type of review article that tries to limit the occurrence of bias. Traditional, non-systematic reviews can be biased because they do not include all of the available papers on the review’s topic; only certain studies are discussed by the author. No formal process is used to decide which articles to include in the review. Consequently, unpublished articles, older papers, works in foreign languages, manuscripts published in small journals, and studies that conflict with the author’s beliefs can be overlooked or excluded. Since traditional reviews do not have to explain the techniques used to select the studies, it can be difficult to determine if the author’s bias affected the review’s findings.

Systematic reviews were developed to address the problem of bias. Unlike traditional reviews, which cover a broad topic, systematic reviews focus on a single question, such as if a particular intervention successfully treats a medical condition. Systematic reviews then track down all of the available studies that address the question, choose some to include in the review, and critique them using predetermined criteria. The studies are found, selected, and evaluated using a formal, scientific methodology in order to minimize the effect of the author’s bias. The methodology is clearly explained in the systematic review so that readers can form opinions about the quality of the review.

Let's take a closer look this systematic review paper by Vigano et al. published in Lancet Oncology :

Finding Review and Research Papers in PubMed

Many databases have special features that allow the searcher to restrict results to articles that match specific criteria. In other words, only articles of a certain type will be displayed in the search results. These “limiters” can be useful when searching for research or review articles. PubMed has a limiter for article type, which is located on the left sidebar of the search results page. This limiter can filter the search results to show only review articles.

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