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Impact of Effective Teamwork on Employee Performance

Profile image of Zubair Hassan

This research examined the impact of Teamwork on employee performance. The study adopted descriptive and explanatory research design. Further this study used a cross sectional survey methods using a survey questionnaires, containing 35 items with Likert Scale (Disagree-1 and 5 for Agree). A questionnaire was developed based on past literature and numerous tests were done to test the normality, reliability and validity of the data. The independent variables to measure effective teamwork are Effective communication, Team Cohesiveness, Accountability, Interpersonal skills, Leadership and Level of trust. The dependent variable used in this research is employee performance. The samples of 107 employees from an entertainment company in Kuala Lumpur capital of Malaysia were selected using simple random probability sampling technique. The collected data was analysed using descriptive means and regression via SPSS.20. This study found that all the chosen factors have significant relationship with teamwork. This research find Efficient Communication, Level of trust, Leadership and Accountability has a positive and significant impact on employee performance. While we found no significant influence of Intrapersonal skills and Cohesiveness on Employee Performance. Though this research included only one entertainment organisations, future studies may include larger sample by conducting the study on more organisations including manufacturing industry, Financial firms etc. to see the variation in the results. The future studies may compare differences based on socio-demographic profile and might examine the similarities and difference of motivational factors in different sectors in Malaysia.

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research paper on teamwork

Work Life is Atlassian’s flagship publication dedicated to unleashing the potential of every team through real-life advice, inspiring stories, and thoughtful perspectives from leaders around the world.

Kelli María Korducki

Contributing Writer

Dominic Price

Work Futurist

Dr. Mahreen Khan

Senior Quantitative Researcher, People Insights

Kat Boogaard

Principal Writer

strong knot of a team

The importance of teamwork (as proven by science)

Healthy teams enjoy benefits that go far beyond the company’s bottom line.

Tracy Middleton

5-second summary

  • Research shows that collaborative problem-solving leads to better outcomes.
  • People are more likely to take calculated risks that lead to innovation if they have the support of a team behind them.
  • Working in a team encourages personal growth, increases job satisfaction, and reduces stress.

Anyone who thought the rise of remote and hybrid work would be the downfall of teamwork has probably changed their tune by now. The truth is, teamwork is more important than ever.

“The use of teams and collaboration expectations have been consistently rising,” says Dr. Scott Tannenbaum , a researcher and president of the Group for Organizational Effectiveness. “And when I say teams, I’m talking about all types of teams, whether it’s stable work teams [or] whether it’s teams that now, in the current environment, are operating virtually.”

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Teamwork is essential to a company’s success, says John J. Murphy, author of Pulling Together: 10 Rules for High-Performance Teamwork . “Each individual has unique gifts, and talents and skills. When we bring them to the table and share them for a common purpose, it can give companies a real competitive advantage.”

But here’s the real magic of teamwork: when done right, it has benefits that go far beyond boosting the company’s bottom line. (Learn about some classic models that can lead to stronger teamwork here .)

10 benefits of teamwork

1. teamwork enables better problem solving.

Albert Einstein gets all the credit for discovering the theory of relativity, but the truth is that he relied on conversations with friends and colleagues to refine his concept. And that’s almost always the case.

“Behind every genius is a team,” says Murphy. “When people play off each other’s skills and knowledge, they can create solutions that are practical and useful.”

Science reinforces the idea that many brains are better than one . “We found that groups of size three, four, and five outperformed the best individuals,” says Dr. Patrick Laughlin a researcher at the University of Illinois at Urbana-Champaign. “[We] attribute this performance to the ability of people to work together to generate and adopt correct responses, reject erroneous responses, and effectively process information.”

Not everyone processes information in the same way. Some people like to jump into problem-solving mode immediately, while others prefer time to gather their thoughts and consider multiple options before making a contribution. Asking people to provide input asynchronously in a tool like Confluence allows everyone the space to work in a way that’s comfortable for them.

2. Teamwork unlocks potential for innovation

According to Frans Johansson, author of The Medici Effect , some of the most innovative ideas happen at “the intersection” – the place where ideas from different industries and cultures collide.

“Most people think success comes from surrounding yourself with others that are like you,” says Johansson. “But true success and breakthrough innovation involves discomfort. Discomfort pushes you to grow. This is where difference of experience, opinion, and perspective come in. Diversity is a well-documented pathway to unlocking new opportunities, overcoming new challenges, and gaining new insights.”

Master these 7 essential skills to level-up your teamwork game

Master these 7 essential skills to level-up your teamwork game

A recent report from the consulting firm McKinsey & Company backs this up. It found teams made up of members from diverse backgrounds (gender, age, ethnicity, etc.) are more creative and perform better by up to 35 percent, compared to more homogeneous teams. Instead of looking at an issue from your individual vantage point, you get a 360-degree picture, which can lead to an exponential increase in ideas.

Research from Tufts University suggests that just being exposed to diversity can shift the way you think. A study on a diverse mock jury found that interacting with individuals who are different forces people to be more open minded, and to expect that reaching consensus will take effort.

3. Teamwork makes for happier employees

As part of our ongoing research on teamwork, we surveyed more than 1,000 team members across a range of industries and found that when honest feedback, mutual respect, and personal openness were encouraged, team members were 80 percent more likely to report higher emotional well-being.

Having happy employees is a worthwhile goal in itself, but the company benefits, too. Research from the University of Warwick in England suggests happy employees are up to 20 percent more productive than unhappy employees. And who couldn’t benefit from a happiness boost?

4. Teamwork enhances personal growth

There may be no “I” in team , but being part of a team can help you grow. “By sharing information and essentially cross training each other, each individual member of the team can flourish,” says Murphy. You might discover new concepts from colleagues with different experiences. You can also learn from someone else’s mistakes, which helps you sidestep future errors.

You might even learn something new about yourself, says Dr. Susan McDaniel, a psychologist at the University of Rochester Medical Center and one of the guest editors of America Psychologist’s special edition on “ The Science of Teamwork .”

“We all have blind spots about our behaviors and strengths that we may be unaware of, and feedback from a team member can expose them,” she says. Recognizing these strengths and addressing the weaknesses can make you a better team member, and even a better person. “Maybe working in a team you’ll discover you could be a better listener. That’s a skill you can grow in, and then take home and use to improve your family interactions,” McDaniel points out.

5. Teamwork lowers the risk of burnout

A Gallup study of nearly 7,500 full-time employees found that 23 percent of employees feel burned out at work very often or always. Another 44 percent say they sometimes feel this way. What helps? Sharing the load.

Team members can provide emotional support to each other because they often understand the demands and stress of completing work even better than managers, says Ben Wigert, lead researcher for Gallup’s workplace management practice.

Managers reading this: you’re not off the hook. The study also found that knowing your boss has your back also protects against burnout.

6. Teamwork gives opportunities for growth

Collaboration in the workplace isn’t unlike teamwork on the baseball diamond. When the pitcher and outfielders each excel at their individual roles, the team has a better chance of winning.

Off the playing field, that idea is more important than ever. Changes in technology and increased globalization mean that organizations are facing problems so complex that a single individual simply can’t possess all the necessary knowledge to solve them, says Wigert. When team members use their unique skills to shine in their own roles, it creates an environment based on mutual respect and cooperation that benefits the whole group, notes Murphy.

7. Teamwork boosts productivity

Getting a pat on the back from the boss can boost an employee’s motivation, but receiving kudos from a team member may be even more effective.

The TINYpulse Employee Engagement and Organizational Culture Report surveyed more than 200,000 employees. Participants reported that having the respect of their peers was the #1 reason they go the extra mile at work.

There’s no I in team, but there’s one in “team branding”

There’s no I in team, but there’s one in “team branding”

8. teamwork allows for smarter risk-taking.

When you work alone, you might be hesitant to put your neck on the line. When you work on a team, you know you have the support of the entire group to fall back on in case of failure. That security typically allows teams to take the kind of risks that create “Eureka!” ideas.

But here’s one place where size does matter. The most disruptive ideas often come from small teams, suggests recent research in the journal Nature , possibly because larger teams argue more, which can get in the way of coming up with those big ideas.

Wharton Business School researchers also discovered that small is the secret to success: they found that two-person teams took 36 minutes to build a Lego figure while four-person teams took 52 minutes to finish — more than 44 percent longer.

There’s no definitive ideal small team size, but consider following Amazon CEO Jeff Bezos’ 2 Pizza Rule : no matter how large your company gets, teams shouldn’t be larger than what two pizzas can feed.

9. Teamwork yields fewer mistakes

If your team has good energy – you encourage and inspire each other, and you have fun together – you’ll feel less stressed, says Murphy. “Studies show that stress makes us stupid, and leads us to make more mistakes,” says Murphy.

Of course, the converse is also true: when your team feels less frazzled, you’ll make fewer errors. That’s worth keeping in mind, especially if you’re one of the 61 percent of workers who cite work as a significant source of stress .

10. Teamwork expands creativity

Stale solutions often come out of working in a vacuum. When people with different perspectives come together in group brainstorms, on the other hand, innovative ideas can rise to the surface – with one caveat. Research shows this can only happen when communication within the team is open and collaborative, notes Wigert. The most creative solutions can only come up when there’s a level of trust that lets team members ask ‘stupid’ questions, propose out-there ideas, and receive constructive criticism.  

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  • v.9(9); 2019

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How effective is teamwork really? The relationship between teamwork and performance in healthcare teams: a systematic review and meta-analysis

Jan b. schmutz.

1 Department of Communication Studies, Northwestern University, Evanston, Illinois, USA

Laurenz L. Meier

2 Department of Work and Organizational Psychology, University of Neuchâtel, Neuchâtel, Switzerland

Tanja Manser

3 FHNW School of Applied Psychology, University of Applied Sciences and Arts Northwestern Switzerland, Olten, Switzerland

Associated Data


To investigate the relationship between teamwork and clinical performance and potential moderating variables of this relationship.

Systematic review and meta-analysis.

Data source

PubMed was searched in June 2018 without a limit on the date of publication. Additional literature was selected through a manual backward search of relevant reviews, manual backward and forward search of studies included in the meta-analysis and contacting of selected authors via email.

Eligibility criteria

Studies were included if they reported a relationship between a teamwork process (eg, coordination, non-technical skills) and a performance measure (eg, checklist based expert rating, errors) in an acute care setting.

Data extraction and synthesis

Moderator variables (ie, professional composition, team familiarity, average team size, task type, patient realism and type of performance measure) were coded and random-effect models were estimated. Two investigators independently extracted information on study characteristics in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines.

The review identified 2002 articles of which 31 were included in the meta-analysis comprising 1390 teams. The sample-sized weighted mean correlation was r = 0.28 (corresponding to an OR of 2.8), indicating that teamwork is positively related to performance. The test of moderators was not significant, suggesting that the examined factors did not influence the average effect of teamwork on performance.

Teamwork has a medium-sized effect on performance. The analysis of moderators illustrated that teamwork relates to performance regardless of characteristics of the team or task. Therefore, healthcare organisations should recognise the value of teamwork and emphasise approaches that maintain and improve teamwork for the benefit of their patients.

Strengths and limitations of this study

  • This systematic review evaluates available studies investigating the effectiveness of teamwork processes.
  • Thirty-one studies have been included resulting in a substantial sample size of 1390 teams.
  • The sample size of the primary studies included is usually low.
  • For some subgroup analysis, the number of studies included was small.


May it be an emergency team in the trauma room, paramedics treating patients after an accident or a surgical team in the operating room, teams are ubiquitous in healthcare and must work across professional, disciplinary and sectorial boundaries. Although the clinical expertise of individual team members is important to ensure high performance, teams must be capable of applying and combining the unique expertise of team members to maintain safety and optimal performance. In order for a team to be effective individual team members need to collaborate and engage in teamwork. Today, experts agree that effective teamwork anchors safe and effective care at various levels of the healthcare systems 1–4 leading to a relatively recent shift towards team research and training. 5–7

Healthcare is an evidence-based field and therefore administrators and providers are seeking evidence in the literature concerning the impact of teamwork on performance outcomes like patient mortality, morbidity, infection rates or adherence to clinical treatment guidelines. Having a closer look at the literature investigating healthcare teams we find mixed and sometimes even contradicting results about the relationship between teamwork and clinical performance. 8 Some studies find a large effect of teamwork on performance outcomes (eg, Carlson et al 9 ) while others report small or no relationships. 10 11 This inconsistency arises due to several reasons. First, the conceptual and empirical literature examining teamwork is fragmented and research examining teamwork effectiveness is spread across disciplines including medicine, psychology and organisation science. Therefore, researchers and practitioners often lack a common conceptual foundation for investigating teams and teamwork in healthcare. Second, research studies on teamwork in healthcare usually exhibit small sample sizes because of the challenges of recruiting actual professional teams and carefully balancing research with patient care priorities. Small sample sizes, however, increase the likelihood of reporting results that fail to represent true effect. Third, studies investigating healthcare teams often ignore important context variables of teams (eg, team composition and size, task characteristics, team environment) that likely influence the effect that teamwork has on clinical performance. 12 13

These inconsistencies in the teamwork literature may lead to confusion about the importance of teamwork in healthcare, thus giving voice to critics who hinder efforts to improve teamwork. We aim to address these problems with a meta-analytical study investigating the performance implications of teamwork. A meta-analytical approach moves beyond existing reviews on teamwork in healthcare 8 14–17 and quantitatively tests if the widely advocated positive effect of teamwork on performance holds true. In addition, this approach allows us to investigate context variables as moderators that may influence the effect of teamwork on performance, meaning that this effect might be stronger or weaker under certain conditions. Previous meta-analyses 18 19 focused mainly on the effectiveness of team trainings but not on the effect of teamwork itself. This meta-analysis will generate quantitative evidence to inform the relevance of future interventions, regulations and policies targeting teamwork in healthcare organisations.

In the following we will first establish an operational definition of teamwork, elaborate on relevant contextual factors and present our respective meta-analytical results and their interpretation.

Teams, teamwork and team performance

In order to clearly understand the impact of teamwork on performance it is necessary to provide a brief introduction to teams, teamwork and team performance. We define teams as identifiable social work units consisting of two or more people with several unique characteristics. These characteristics include ( a ) dynamic social interaction with meaningful interdependencies, ( b ) shared and valued goals , (c ) a discrete lifespan, ( e ) distributed expertise and ( f ) clearly assigned roles and responsibilities. 20 21 Based on this definition it becomes clear that teams must dynamically share information and resources among members and coordinate their activities in order to fulfil a certain task — in other words teams need to engage in teamwork .

Teamwork as a term is widely used and often difficult to grasp. However, we absolutely require a clear definition of teamwork especially for team trainings that target specific behaviours. Teamwork is a process that describes interactions among team members who combine collective resources to resolve task demands (eg, giving clear orders). 22 23 Teamwork or team processes can be differentiated from taskwork. Taskwork denotes a team’s individual interaction with tasks, tools, machines and systems. 23 Taskwork is independent of other team members and is often described as what a team is doing whereas teamwork is how the members of a team are doing something with each other. 24 Therefore, team performance represents the accumulation of teamwork and taskwork (ie, what the team actually does). 25

Team performance is often described in terms of inputs, processes and outputs (IPO). 22 26–28 Outputs like quality of care, errors or performance are influenced by team related processes (ie, teamwork) like communication, coordination or decision-making. Furthermore, these processes are influenced by various inputs like team members’ experience, task complexity, time pressure and more. The IPO framework emphasises the critical role of team processes as the mechanism by which team members combine their resources and abilities, shaped by the context, to resolve team task demands. It has been the basis of other more advanced models 27–29 but has also been criticised because of its simplicity. 30 However, it is still the most popular framework to date and helps to systematise the mechanisms that predict team performance and represents the basis for the selection of the studies included in our meta-analysis.

Contextual factors of teamwork effectiveness

Based on a large body of team research from various domains, we hypothesise that several contextual and methodological factors might moderate the effectiveness of teamwork, indicating that teamwork is more important under certain conditions. 31 32 Therefore, we investigate several factors: (a) team characteristics (ie, professional composition, team familiarity, team size), (b) task type (ie, routine vs non-routine tasks), (c) two methodological factors related to patient realism (ie, simulated vs real) and (d) the type of performance measures used (ie, process vs outcome performance). In the following we discuss these potentially moderating factors and the proposed effects on teamwork.

Professional composition

We distinguished between interprofessional and uniprofessional teams. Interprofessional teams consist of members from various professions that must work together in a coordinated fashion. 33 Diverse educational paths in interprofessional teams may shape respective values, beliefs, attitudes and behaviours. 34 As a result team members with different backgrounds might perceive and interpret the environment differently and have a different understanding of how to work together. Therefore, we assume that explicit teamwork is especially important in interprofessional teams compared with uniprofessional teams.

Team familiarity

If team members have worked together, they are familiar with their individual working styles; and roles and responsibilities are usually clear. If a team works together for the first time, this potential lack of familiarity and clarity might make teamwork even more important. Therefore, we differentiate between real teams that also work together in their everyday clinical practice and experiential teams that only came together for study purposes.

Another factor that may moderate the relationship between teamwork and performance is team size. Since larger teams exhibit more linkages among members than smaller teams, they also face greater coordination challenges. Also, with increasing size teams have greater difficulty developing and maintaining role structures and responsibilities. For these reasons, we expect the influence of teamwork on clinical performance to be stronger in larger teams as compared with smaller teams.

Routine situations are characterised by repetitive and unvarying actions (eg, standard anaesthesia induction). 35 In contrast, non-routine situations exhibit more variation and uncertainty, requiring teams to be flexible and adaptive. Whereas team members mostly rely on pre-learned sequences during routine situations, during non-routine situations we assume that teamwork is more important in order for team members to resolve task demands.

Patient realism

Authors highlight the importance of using medical simulators in education. 36 Therefore, we investigate the realism used in a study (simulated vs real patients) as a potential methodological factor that influences the relationship between teamwork and performance. Studies conducted with medical simulators might be more standardised and less influenced by confounding variables than studies conducted with real patients. Therefore, results from simulation studies might show stronger relationships between the two variables. Further, using a simulator could cause individuals and teams to act differently than in real settings, thereby distorting the results. However, in the last decade high-fidelity simulators have become increasingly realistic, suggesting that the results from simulation studies generalise to real environments. Including realism as a contextual factor in our analysis will reveal if the effects of teamwork observed in simulation compare with real life settings. Better understanding would provide important insights about simulation use in teamwork studies.

Performance measures

As a second methodological factor, we expect that the type of performance measure used in a study influences the reported teamwork effectiveness. The literature usually differentiates between process-related and outcome-related aspects of performance. 37 38 Process performance measures are action-related aspects and refer to adequate behaviour during procedures (eg, adhering to guidelines), making them easier to assess. Outcome performance measures (eg, infection rates after operations) follow team actions, with assessment occurring later than process measures. Outcome performance measures suffer from several factors: greater sensitivity to confounding variables (eg, comorbidities), assessment challenges and greater difficulty linking team processes to outcomes. Looking at the predictors of the survival of cardiac arrest patients illustrates the difference between the two types of performance measures. The main predictors for the survival (ie, performance outcome) of a cardiac arrest patient are ‘duration of the arrest’ and ‘age of the patient less than 70’ . 39 Although a team delivers perfect basic life support (ie, high process performance) the patient can still die (ie, low outcome performance). Due to these methodological considerations, we expect that studies assessing process performance report a stronger relationship between teamwork and performance than studies assessing outcome performance.

The study was conducted based on the recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement 40 as well as established guidelines in social sciences. 41 42 Through the combination of studies in the meta-analytical process, we will increase the statistical power and provide an accurate estimation of the true impact that teamwork has on performance.

Search strategy

We applied the following search strategy to select relevant papers: ( a ) an electronic search of the database PubMed (no limit was placed on the date of publication, last search 19 June 2018) using the keywords teamwork , coordination , decision-making , leadership and communication in combination with patient safety , clinical performance , the final syntax for PubMed is available ( online supplementary file ), (b) a manual backwards search for all references cited by eight systematic literature reviews that focus on teamwork or non-technical skills in various healthcare domains, 8 15 17 43–47 (c) a manual backwards search for all references cited in studies we included in our meta-analysis, (d) a manual forward search using Web of Science to identify studies that cite the studies we included in our meta-analysis, (e) identification of relevant unpublished manuscripts via email from authors currently investigating medical teams using specific mailing lists.

Supplementary data

Inclusion criteria.

Studies were included if a construct complied to the definition of teamwork processes outlined in the introduction (eg, coordination, communication). In addition, studies needed to investigate the relationship between at least one teamwork process and a performance measure (eg, patient outcome). When studies reported multiple estimates of the same relationship from the same sample (eg, between coordination and more than one indicator of performance), those correlations were examined separately only as appropriate for sub-analyses, but an average correlation was computed for all global meta-analyses of those relationships to maintain independence. 41 We excluded articles investigating long-term care since the coordination of care for chronically ill patients has to consider the unique team task interdependencies in this setting. 48 Also, teams working together over longer periods of time are more likely to develop emergent states (eg, team cohesion) that influence how a specific team works together. 24 All articles included in this meta-analysis are listed in tables 1 and 2 .

Descriptions of study objectives, settings and description of teamwork process and outcome measures

ICU, intensive care unit.

Studies, effect sizes and moderator variables included in the meta-analytical database

*Carlson, Min & Bridges has been identified as an outlier and therefore excluded from the analysis.

†Effect sizes ( r ) with an † represent an average for a single sample and a single outcome and have been combined for this meta-analysis.

For the criterion level of analysis, we included only effect sizes at the team level and not on an individual level. Therefore, the performance measure had to be clearly linked to a team. This approach aligns with research that strongly recommends against mixing levels of analysis in meta-analytical integrations. 49 50

Two reviewers independently screened titles and abstracts from articles yielded in the search. Afterwards full texts of all relevant articles were obtained and screened by the same two reviewers. Agreement was above 90%. Any disagreement in the selection process was resolved through consensus discussion.

Data extraction

With the help of a jointly developed coding scheme, studies were independently coded by one of the authors (JS) and another rater, both with a background in industrial psychology and human factors. Twenty per cent of the studies were rated by both coders. Intercoder agreement was above 90%. Any disagreement was resolved through discussion. The data extracted comprised details of the authors and publication as well as important study characteristics and statistical relationships between a teamwork variable and performance ( table 2 ).

Coding of team characteristics

The professional composition of teams was coded either as ‘Interprofessional’ if a team consisted of members from different professions (eg, nurses and physicians) or as ‘Uniprofessional’ if the members of the teams were of the same profession. Team size was coded as the number of members (average number if team size varied) of the investigated teams. Team familiarity was coded either as ‘experimental’ or ‘real’. ‘Real’ indicates that the team members also worked together in their everyday clinical practice. ‘Experimental’ means that the teams only worked together during the study.

Coding of task characteristics

Task type was coded either as ‘Routine task’ or ‘Non-routine task’. We defined ‘Non-routine tasks’ as unexpected events that require flexible behaviour often under time-pressure (eg, emergency situations). ‘Routine tasks’ describe previously planned standard procedures (eg, standard anaesthesia induction, planned surgery).

Coding of methodological factors

Patient realism was either coded as ‘Real patient’ or ‘Simulated patient’. ‘Simulated patient’ included a patient simulator (manikin) whereas ‘Real patient’ included real patients in clinical settings.

Clinical performance measures were coded either as ‘Outcome performance’ or ‘Process performance’. 38 51 ‘Outcome performance’ includes an outcome that is measured after the treatment process (eg, infection rate, mortality). We focused only on patient-related outcomes and not on team outcomes (eg, team satisfaction). ‘Process performance’ describes the evaluation of the treatment process and describes how well the process was executed (eg, adherence to guidelines through expert rating). Process performance measures are often based on official guidelines and extensive expert knowledge. 52 Thus, we assumed that process performance closely relates to patient outcomes.

Statistical analysis

Different types of effect sizes (eg, OR, F values and r ) have been reported in the original studies. We therefore converted the different effect sizes to a common metric, namely r using the formulas provided by Borenstein et al 53 and Walker. 54 Moreover, some samples contained effect sizes of teamwork with two or more measures of performance. Because independence of the included effects sizes is required for a meta-analysis, 41 55 we used Fisher’s z score to average the multiple correlations from the same sample (scholars have suggested to convert r to Fisher's z scores, to average the z’s and then to backtransform it to r . 56 Using simple arithmetic average (ie, correlations will be summed and divided by the number of coefficients) is problematic because the distribution of r becomes negatively skewed as the correlation is larger than zero. As a result, the average r tends to underestimate the population correlation). The correlations were weighted for sample size. However, in contrast to many meta-analyses in social sciences, the correlations were not adjusted for measurement reliability. This is because information about the measurement reliability could not be compared (Kappa vs Cronbach’s Alpha) or were not available at all for the majority of studies. Therefore, we report uncorrected, sample-size weighted mean correlation, its 95% CI, and the 80% credibility interval (CR). The CI reflects the accuracy of a point estimate and can be used to examine the significance of the effect size estimates, whereas the CR refers to the deviation of these estimates and informs us about the existence of possible moderators.

Random-effects models were estimated based on two considerations. 57 First, we expected study heterogeneity to be high given the different study design characteristics such as patient realism (‘Real patient’ vs ‘Simulated patient’), task type (‘Routine task’ vs ‘Non-routine task’) and different forms of performance measures. Second, we aimed to provide an inference on the average effect in the entire population of studies from which the included studies are assumed to be a random selection of it. Therefore, random-effects models were estimated. 57 These models were calculated by the restricted maximum-likelihood estimator, an efficient and unbiased estimator. 58 Since we included only descriptive studies and no interventions we only included the sample size of the individual studies as a potential bias into the meta-analysis. To rule out a potential publication bias, we tested for funnel plot asymmetry using the random-effect version of the Egger test. 59 The results indicate that there is no asymmetry in the funnel plot (z=1.79, p=0.074), suggesting that there is no publication bias.

The estimation of meta-analytical models including the outlier analyses were performed with the package ‘metafor’ from the programming language and statistical environment R. 58

The online search resulted in 2002 articles ( figure 1 ). Two studies were identified via contacting authors directly and have been presented at conferences in the past. 60 61 After duplicates were removed 1988 articles were screened using title and abstract. Sixty-seven articles were then selected for a full text review. Full text examination, forward and backward search of selected articles and relevant reviews resulted in 30 studies coming from 28 articles (two publications presented two independent studies in one publication 62 63 ). This led to a total of 32 studies coming from 30 articles. Following the recommendation by Viechtbauer and Cheung, 64 we screened for outliers using studentized deleted residuals. One case (Carlson et al , 9 r =0.89, n=44, studentized deleted residuals=4.26) was identified as outlier and therefore excluded from further analyses, resulting in a final sample size of k =31.

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Systematic literature search.

Table 1 provides a qualitative description of the selected articles including study objectives, the setting in which the studies were carried out and a description of the teamwork processes as well as the outcome measures that were assessed. If a specific tool for the assessment of a teamwork process or outcome measure was used this is indicated in the corresponding column. Observational studies were most prevalent. Teamwork processes were assessed using either behaviourally anchored rating scales (n=8) or structured observation (n=19) of specific teamwork behaviour. Structured observation — as we describe it — is defined as a purely descriptive assessment of certain behaviour usually using a predefined observation system (eg, amount of speaking up behaviour). In contrast, behaviourally anchored rating scales consist of an evaluation of teamwork process behaviour by an expert. Only three studies used surveys to assess teamwork behaviours. The majority of the studies (n = 27) assessed process performance using either a checklist based expert rating or assessing a reaction time measure after the occurrence of a certain event (eg, time until intervention). Only four studies assessed outcome performance measures. Measures included accuracy of diagnosis, postoperative complications and death, surgical morbidity and mortality, ventilator-associated pneumonia, bloodstream infections, pressure ulcers and acute physiology and chronic health evaluation score. Table 2 provides an overview of all variables included in the meta-analysis including the effect sizes and moderator variables.

Effect of teamwork and contextual factors

Table 3 and figure 2 shows the relationship between teamwork and team performance. The sample-sized weighted mean correlation was 0.28 (95% CI 0.20 to 0.35, z =6.55, p<0.001), indicating that teamwork is positively related to clinical performance. Results further indicated heterogeneous effect size distributions across the included samples ( Q =53.73, p<0.05, I 2 =45.96), signifying that the variability across the sample effect sizes was more than what would be expected from sampling error alone.

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Relationship between teamwork processes and performance.

Meta-analytical relationships between teamwork and clinical performance

* p < .05.

I 2 = % of total variability in the effect size estimates due to heterogeneity among true effects (vs sampling error).

†Team size was entered as a continuous variable, therefore, no subgroup analyses exist.

CI, confidence interval; CR, credibility interval; K, number of studies; N, cumulative sample size (number of teams); Q, test statistic for residual heterogeneity of the models; r, sample-size weighted correlation.

To test for moderator effects of the contextual factors, we conducted mixed-effects models including the mentioned moderators: professional composition, team familiarity, team size, task type, patient realism and performance measures .

The omnibus test of moderators was not significant ( F =0.18, df 1 =6, df 2 =18, p>0.20), suggesting that the examined contextual factors did not influence the average effect of teamwork on clinical performance. To provide greater detail about the role of the contextual factors, we conducted separate analyses for the categorical contextual factors and report them in table 3 .

With this study, we aimed to provide evidence for the performance implications of teamwork in healthcare teams. By including various contextual factors, we investigated potential contingencies that these factors might have on the relationship between teamwork and clinical performance. The analysis of 1390 teams from 31 different studies showed that teamwork has a medium sized effect ( r =0.28 65 66 ;) on clinical performance across various care settings. Our study is the first to investigate this relationship quantitatively with a meta-analytical procedure. This finding aligns with and advances previous work that explored this relationship in a qualitative way. 8 15 17 43–47

At first glance a correlation of r =0.28 might not seem very high. However, we would like to highlight that r =0.28 is considered a medium sized effect 65 66 and should not be underestimated. To better illustrate what this effect means we transformed the correlation into an OR of 2.8. 53 Of course, this transformation simplifies the correlation because teamwork and often the outcome measures are not simple dichotomous variables that can be divided into an intervention and control group. However, this transformation illustrates that teams who engage in teamwork processes are 2.8 times more likely to achieve high performance than teams who are not. Looking at the performance measures in our study we see that they either describe patient outcomes (eg, mortality, morbidity) or are closely related to patient outcomes (eg, adherence to treatment guidelines). Thus, we consider teamwork a performance-relevant process that needs to be promoted through training and implementation into treatment guidelines and policies.

The included studies used a variety of different measures for clinical performance. This variability resulted from the different clinical contexts in which the studies were carried out. There is no universal measure for clinical performance because the outcome is in most cases context specific. In surgery, common performance measures are surgical complications, mortality or morbidity. 67 In anaesthesia, studies often use expert ratings based on checklists to assess the provision of anaesthesia. Expert ratings are also the common form of performance assessment in simulator settings where patient outcomes like morbidity or mortality cannot be measured. Future studies need to be aware that clinical performance measures depend on the clinical context and that the development of valid performance measures requires considerable effort and scientific rigour. Guidelines on how to develop performance assessment tools for specific clinical scenarios exist and need to be accounted for. 52 68 69 Furthermore, depending on the clinical setting researchers need to evaluate what specific clinical performance measures are suitable and if and how they can be linked to team processes in a meaningful way.

The analysis of moderators illustrates that teamwork is related with performance under a variety of conditions. Our results suggest that teams in different contexts characterised by different team constellations, team size and levels of acuity of care all benefit from teamwork. Therefore, clinicians and educators from all fields should strive to maintain or increase effective teamwork. In recent years, there has been an upsurge in crisis resource management (CRM). 19 These trainings focus on team management and implement various teamwork principles during crisis situations (eg, emergencies). 70 Our results suggest that team trainings should not only focus on non-routine situations like emergencies but also on routine situations (eg, routine anaesthesia induction, routine surgery) because based on our data teamwork is equally important in such situations.

A closer look at methodological factors of the included studies revealed that the observed relationship between teamwork and performance in simulation settings does not differ from relationships observed in real settings. Therefore, we conclude that teamwork studies conducted in simulation settings generalise to real life settings in acute care. Further, the analysis of different performance measures reveals a trend towards process performance measures being more strongly related with teamwork than outcome performance measures. A possible explanation of this finding relates to the difficulty of investigating outcome performance measures in a manner isolated from other variables. Nevertheless, we still found a significant relationship between teamwork and objective patient outcomes (eg, postoperative complications, bloodstream infections) despite the methodological challenges of measuring outcome performance and the small number of studies using outcome performance ( k =4).

Our results are in line with previous meta-analyses investigating the effectiveness of team training in healthcare. 18 19 Similar to our results, Hughes et al highlighted the effectiveness of team trainings under a variety of conditions — irrespective of team composition, 18 simulator fidelity or patient acuity of the trainee’s unit as well as other factors.

We were unable to find a moderation of task type in our study, potentially explained by task interdependence, which reflects the degree to which team members depend on one another for their effort, information and resources. 71 A meta-analysis including teams from multiple industries (eg, project teams, management teams) found that task interdependence moderates the relationship between teamwork and performance, demonstrating the importance of teamwork for highly interdependent team tasks. 72 Most studies included in our analysis focused on rather short and intense patient care episodes (eg, a surgery, a resuscitation task) with high task interdependence, which may explain the high relevance of teamwork for all these teams.

Limitations and future directions

Despite greater attention to healthcare team research and team training over the last decade, we were only able to identify 32 studies (31 included in the meta-analysis). Of note, over two-thirds of the studies in our analysis emerged in the last 10 years, reflecting the increasing interest in the topic. The rather small number of studies might relate to the difficulties in quantifying teamwork, the considerable theoretical and methodological knowledge required and the challenges of capturing relevant outcome measures. Also, besides the manual searches of selected articles and reviews and contacting authors in the field we did only search the database PubMed. PubMed is the most common database to access papers that potentially investigate medical teams and includes approximately 30 000 journals from the field of medicine, psychology and management. We are fairly confident that through the additional inclusion of relevant reviews and forward and backwards search, our results represent an accurate representation of what can be found in the literature.

Future research should build on recent theoretical and applied work 24 26 28 73 about teamwork and use this current meta-analysis as a signpost for future investigations. In order to move our field forward, we must use existing conceptual frameworks 22 24 26 and establish standards for investigating teams and teamwork. This can often only be achieved with interdisciplinary research teams including experts from the medical fields but equally important from health professions education, psychology or communication studies.

Another limitation relates to the unbalanced analysis of subgroups. For example, we only identified four studies that used outcome performance variables compared with 27 using process performance measures. Uneven groups may reduce the power to detect significant differences. Therefore, we encourage future studies to include outcome performance measures despite the effort required.

Finally, more factors may influence the relationship between teamwork and performance that we were unable to extract from the studies. While we tested for the effects of team familiarity by comparing experimental teams and real teams, this does not fully capture team member familiarity. The extent to which team members actually worked together during prior clinical practice might predict of how effectively they perform together. However, even two people working in the same ward might actually not have interacted much during patient care depending on the setting. Also team climate on a ward or in a hospital may be an important predictor of how well teams work together, especially related to sharing information or speaking up within the team. 74 75

Finally, the clinical context might play a role in how team members collaborate. In different disciplines, departments or healthcare institutions different norms and routines exist on how to work together. Therefore, study results and recommendations about teamwork need to be interpreted in the light of the respective clinical context. There are empirical indications that a one-size-fits-all approach might not be suitable and team training efforts cannot ignore the clinical context, especially the routines and norms about collaboration. 76 We acknowledge that there might be other factors surrounding healthcare teams that might potentially influence teamwork and clinical performance. However, in this review we could only extract data that was reported in the primary studies. Since these were limited in the healthcare contexts studied, the results might not generalise to long-term care settings or mental health, for example. Future work needs to consider and also document a broader range of potentially influencing factors.

The current meta-analysis confirms that teamwork across various team compositions represents a powerful process to improve patient care. Good teamwork can be achieved by joint reflection about teamwork during clinical event debriefings 77 78 as well as team trainings 79 and system improvement. All healthcare organisations should recognise these findings and place continuous efforts into maintaining and improving teamwork for the benefit of their patients.

Supplementary Material


The authors thank Manuel Stühlinger for his help with study selection and data extraction and Walter J. Eppich, MD, PhD for a critical review and proofreading the manuscript.

Contributors: All authors substantially contributed to this study and were involved in the study design. JS drafted the paper. LM analysed the data and revised the manuscript for content. TM revised the manuscript for content and language. All authors approved the final version.

Funding: This work was funded by the European Society of Anaesthesiology (ESA) and the Swiss National Science Foundation (SNSF, Grant No. P300P1_177695). The ESA provided resources for an additional research assistant helping with literature search and selection. Part of the salary of JS was funded by the SNSF.

Competing interests: None declared.

Patient and public involvement statement: Patients and public were not involved in this study.

Patient consent for publication: Not required.

Provenance and peer review: Not commissioned; externally peer reviewed.

Data availability statement: Data are available upon reasonable request.


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