Colleagues, connection, and belonging at work: what the evidence shows
The psychology and sociology of workplace relationships, the mechanisms linking colleague connection to health and performance, the risks of too little and too much social contact, and the evidence base for introvert-inclusive approaches to engagement at work
Key takeaways: Positive workplace relationships are consistently and reliably associated with higher wellbeing, stronger work engagement, lower burnout risk, and reduced intention to leave. Social connection at work acts as a buffer against occupational stress, but the relationship is not linear: certain configurations of workplace ties — particularly those characterised by high density and cross-departmental bridging — can increase role strain and stress. Social stressors, including conflict, exclusion, and perceived marginalisation, have moderate negative effects on job satisfaction and health. The evidence supports a model of colleague connection that is warm, consistent, and autonomous rather than obligatory or high-intensity. For introverted employees, the research confirms that low-pressure, choice-based interaction is not a compromise but the mode of engagement most likely to be sustainable. Workplace friendship and organisational social climate independently predict retention, commitment, and psychological wellbeing, with work-based social ties primarily supporting occupational wellbeing and non-work ties supporting general wellbeing.
The Open Post sets out the practical case for investing in workplace relationships: that colleague connection reduces stress, improves engagement, supports resilience, and makes daily working life more sustainable. It also argues — consistent with the evidence — that this is not about maximal sociability, but about the right quality and quantity of connection for each individual. This Deep Dive examines the research that underpins those claims. It covers the mechanisms through which workplace social ties influence health and performance, the epidemiology of workplace friendship and wellbeing, the evidence on social stressors and when connection becomes harmful, the specific research literature on introversion and personality diversity at work, and the question of how inside-work and outside-work relationships differ in their effects.
How researchers study workplace social connection
The evidence base on colleague relationships draws on several distinct methodological traditions. Large-scale survey research uses validated scales measuring constructs including workplace friendship quality, social climate, perceived social support, and sense of belonging to examine associations with self-reported wellbeing, engagement, burnout, and turnover intention. These studies provide the epidemiological backbone of the field, with large samples permitting control for major confounders including job demands, occupational level, income, and pre-existing mental health.
Meta-analyses synthesise findings across primary studies, providing more reliable estimates of effect sizes and directions. Several recent meta-analyses specifically examine workplace friendship, social connection, and wellbeing outcomes; these are central to the evidence summarised here. Experimental and diary studies provide evidence on short-term and day-level mechanisms — for example, the contagion of engagement between colleagues, or the daily regulation of mood through peer interactions. Qualitative and organisational research contributes evidence on how workplace cultures and structural features shape the social environment.
The field has developed rapidly since approximately 2019, with increased methodological sophistication including mediation analysis, longitudinal designs, and structural equation modelling.
The mechanisms: how colleague connection affects wellbeing
The relationship between social connection at work and employee wellbeing operates through several distinct but interacting mechanisms. Understanding these pathways helps explain why the quality and structure of social ties matter, not just their presence.
Social support as a stress buffer
Perceived social support — the belief that colleagues are available and willing to help — is one of the most consistently documented moderators of occupational stress. The stress-buffering hypothesis holds that social support does not primarily reduce baseline stress, but instead attenuates the negative effects of high job demands, workplace adversity, and difficult periods. Employees with strong colleague networks report better coping, lower emotional exhaustion during high-demand periods, and faster recovery after workplace difficulties. This buffering effect has been documented across occupational sectors including healthcare, education, manufacturing, and professional services.
KEY RESEARCH
Yang, G., & Khan, M. (2025). Professional well-being pathways: examining how social structures and workplace fulfilment influence stress-related outcomes among healthcare practitioners. BMC Health Services Research, 25. https://doi.org/10.1186/s12913-025-13352-x
This study examined social structures and well-being among healthcare practitioners — a high-demand occupational group with significant burnout risk. It found that workplace social support and colleague connection were associated with lower stress-related outcomes through fulfilment and meaning pathways, confirming the stress-buffering function of social ties in professionally demanding environments. The findings supported a model in which colleague relationships contribute to well-being not only directly but by moderating the relationship between job demands and distress.
Engagement contagion and team-level effects
Work engagement — characterised by vigour, dedication, and absorption in work — is partly a social phenomenon. Research in organisational psychology has documented that engagement is ‘contagious’ within teams: employees who work alongside highly engaged colleagues tend themselves to show higher engagement over time, through mechanisms including emotional contagion, modelling of work behaviours, and mutual motivation. This means that colleague relationships do not merely make individuals feel better; they shape the collective energy and performance of the teams in which they are embedded.
KEY RESEARCH
Bakker, A. (2022). The social psychology of work engagement: state of the field. Career Development International. https://doi.org/10.1108/cdi-08-2021-0213
This state-of-the-field review synthesised the substantial body of evidence on the social psychology of work engagement, confirming the role of colleague interactions in shaping individual and team-level engagement. It documented the contagion mechanism — whereby engaged employees positively influence the engagement of those around them through daily interactions — and highlighted the role of social climate in sustaining or undermining engagement at an organisational level. The review called for greater attention to relationship quality, not merely relationship presence, as the active ingredient in social engagement effects.
KEY RESEARCH
Liao, Y., Huang, M., Gu, Z., et al. (2025). Associations between perceived stress profiles, social connection and work engagement in clinical registered nurses: a mediation analysis and generalised additive models. BMC Nursing, 24. https://doi.org/10.1186/s12912-025-03754-x
This mediation analysis found that social connection among nursing staff was associated with higher work engagement, with perceived stress functioning as a mediating variable: greater social connection was associated with lower perceived stress, which in turn predicted higher engagement. Importantly, the study used generalised additive models capable of capturing non-linear relationships, finding that the engagement-boosting effect of social connection was strongest at moderate levels of connection and levelled off at high levels — an early signal of the curvilinear dynamics that appear in the wider literature.
Belonging, commitment, and retention
A sense of belonging — the perception that one is accepted, valued, and included within one’s workplace community — is a distinct but related construct to workplace friendship. Research consistently finds that belonging is associated with higher organisational commitment, stronger identification with the organisation, and lower turnover intention. Workplace friendship and positive social climate are among the primary organisational predictors of belonging.
KEY RESEARCH
Chen, Y., Wang, Y., & Chu, H. (2024). Meta-analytic structural equation modelling for exploring workplace friendship, well-being, and organisational commitment. Work, 79, 1039–1053. https://doi.org/10.3233/wor-230482
This meta-analysis used structural equation modelling across multiple primary studies to examine the pathways between workplace friendship, well-being, and organisational commitment. It found that workplace friendship had significant positive effects on both psychological well-being and organisational commitment, and that well-being partially mediated the friendship-commitment relationship. The effect sizes were meaningful across occupational groups, and the findings were robust to controls for age, tenure, and organisational size. Importantly, friendship quality — rather than friendship quantity — emerged as the more consistent predictor of well-being outcomes.
KEY RESEARCH
Bilgi̇noğlu, E., & Yozgat, U. (2022). Retaining employees through organisational social climate, sense of belonging and workplace friendship: a research in the financial sector. Istanbul Business Research. https://doi.org/10.26650/ibr.2023.52.806695
This study in the financial sector examined the pathways through which workplace friendship and social climate reduced turnover intention. It found that sense of belonging mediated the relationship between workplace friendship and retention-related outcomes, and that positive organisational social climate amplified the friendship-belonging relationship. The study highlights the structural dimension of workplace connection: individual friendship matters, but the broader social environment in which it develops shapes its effects.
When connection becomes harmful: social stressors at work
The positive case for colleague connection is compelling, but the evidence base also documents the conditions under which social contact at work causes harm. This is an important part of the picture that the Open Post also addresses: the goal is calibrated connection, not maximum social exposure.
KEY RESEARCH
Gerhardt, C., Semmer, N., Sauter, S., et al. (2021). How are social stressors at work related to well-being and health? A systematic review and meta-analysis. BMC Public Health, 21. https://doi.org/10.1186/s12889-021-10894-7
This systematic review and meta-analysis examined the effects of workplace social stressors — including interpersonal conflict, incivility, exclusion, and perceived unfairness — on employee health and well-being. It found moderate negative effects of social stressors on job satisfaction, organisational commitment, and self-reported health, and positive associations with burnout and counterproductive work behaviour. Effect sizes were comparable to those observed for high job demands and low job control, confirming that the social environment is a health-relevant occupational exposure in its own right, not merely background context.
KEY RESEARCH
Sader, M., Chollet, B., Brion, S., & Trendel, O. (2021). Supported, detached, or marginalised? The ambivalent role of social capital on stress at work. European Management Journal. https://doi.org/10.1016/j.emj.2021.03.002
This study examined the structural dimensions of workplace social networks and their relationship with occupational stress. It found that employees with very dense networks of close ties (‘supported’ configuration) reported lower stress, as expected. However, employees whose networks consisted primarily of bridging ties across departments and teams — a configuration associated with information access and career mobility — sometimes reported higher role ambiguity and strain. Most strikingly, employees with sparse or peripheral network positions (‘marginalised’) reported the highest stress. The study underscores that network structure, not merely connection presence, matters for health.
The practical implication of this research is that connection should be cultivated selectively and sustainably. A small number of close, trusted colleague relationships appears to confer substantially more wellbeing benefit than a large number of superficial or obligatory interactions. The evidence does not support a ‘more is better’ model of workplace socialising.
Inside work and outside work: are the effects different?
The evidence that informal organisational activities — shared breaks, team lunches, cross-team social events — strengthen belonging and reduce turnover intentions is supported by several studies. The mechanism appears to operate through enhanced familiarity and trust, which in turn improve collaboration quality and reduce the social anxiety of daily workplace interaction. However, the effect depends on the voluntariness of participation: activities perceived as mandatory social performance are associated with worse rather than better outcomes among employees who are already socially fatigued.
KEY RESEARCH
Craig, L., & Kuykendall, L. (2019). Examining the role of friendship for employee well-being. Journal of Vocational Behavior, 115, 103313. https://doi.org/10.1016/j.jvb.2019.06.001
This study directly compared the effects of work-based friendships and non-work friendships on employee well-being. It found that workplace friendships were more strongly associated with occupational well-being — job satisfaction, work engagement, and reduced emotional exhaustion — while non-work friendships were more strongly associated with general life satisfaction and personal well-being. Both types of friendship mattered; they operated through partially distinct pathways and complemented rather than substituted for each other. The finding is practically relevant: strengthening workplace ties addresses a domain of well-being that out-of-work social life, however rich, may not fully compensate for.
KEY RESEARCH
Zhang, Y., Sun, J., Shaffer, M., & Lin, C. (2021). High commitment work systems and employee well-being: the roles of workplace friendship and task interdependence. Human Resource Management. https://doi.org/10.1002/hrm.22093
This study examined the role of workplace friendship in organisations with high-commitment work practices. It found that workplace friendship significantly moderated the relationship between demanding work systems and employee well-being: in the presence of strong workplace friendships, the well-being costs of high-commitment work systems were substantially reduced. Task interdependence — the degree to which employees need to coordinate and depend on each other to complete their work — amplified the protective effect of friendship. The study suggests that colleague connection is particularly important in demanding organisational environments.
Introversion, personality diversity, and workplace inclusion
A distinct literature addresses the experience of introverted employees in workplace social environments. This research is important because much of the broader workplace friendship literature implicitly assumes extraverted norms: the value placed on initiating social contact, participating in group activities, and maintaining an outgoing interpersonal style.
KEY RESEARCH
Blevins, D., Stackhouse, M., & Dionne, S. (2021). Righting the balance: Understanding introverts (and extraverts) in the workplace. International Journal of Management Reviews. https://doi.org/10.1111/ijmr.12268
This review systematically examined the literature on introversion and extraversion in organisational settings. It documented a pervasive ‘pro-extraversion bias’ in workplaces: extraverted behaviours — speaking up, initiating contact, leading visibly — are disproportionately rewarded in most organisational cultures, creating disadvantage for introverted employees that is independent of their actual competence or contribution. The review argued that organisations miss the distinct strengths of introverted employees — including depth of focus, careful listening, and thoughtful decision-making — by designing social and performance systems around extraverted defaults.
KEY RESEARCH
Herbert, J., Ferri, L., Hernández, B., et al. (2023). Personality diversity in the workplace: A systematic literature review on introversion. Journal of Workplace Behavioral Health, 38, 165–187. https://doi.org/10.1080/15555240.2023.2192504
This systematic review specifically focused on introversion in workplace contexts, finding that introverted employees benefit from flexible work designs, quieter physical environments, and autonomy over how, when, and with whom they interact socially. Hybrid and remote work arrangements were associated with improved wellbeing for introverted employees when boundary conditions — clear separation of work and personal space, control over availability — were met. The review found no evidence that introverted employees were inherently less engaged or less effective than extraverted colleagues; differences in observable social behaviour should not be conflated with differences in commitment or contribution.
KEY RESEARCH
McCord, M. (2025). Sounds of silence: Using the Stereotype Content Model to understand perceptions of introverts and extraverts at work. Occupational Health Science, 9, 331–361. https://doi.org/10.1007/s41542-024-00218-7
This 2025 study applied the Stereotype Content Model to workplace perceptions of introverts and extraverts, finding that introverted workers were consistently rated lower on both warmth and competence by evaluators — regardless of whether those evaluators were themselves introverted or extraverted. These stereotype-based ratings have practical consequences: introverted employees may face higher barriers to recognition, mentorship, and advancement that are independent of their actual performance. The study reinforces the importance of creating structural conditions — not just cultural rhetoric — that support diverse social styles.
Taken together, this literature supports a model of inclusive workplace connection in which employees have genuine autonomy over the mode, frequency, and intensity of their social engagement. The wellbeing benefits of colleague connection are not reserved for extraverts: they are available to introverted employees through one-on-one interaction, shared task-focused collaboration, and other lower-intensity social formats that do not require the performance of extraverted sociability.
Limitations and caveats
Several caveats are appropriate when interpreting the evidence base on workplace social connection and wellbeing. Much of the foundational research is cross-sectional: associations between colleague friendship quality and wellbeing outcomes are well-documented, but causal direction is not always established. It is plausible that employees who are already higher in wellbeing are more likely to form and sustain workplace friendships, producing reverse-causation that inflates association estimates.
Self-report measures dominate both the exposure variable (quality of workplace relationships) and the outcome variable (wellbeing, engagement, satisfaction), creating common-method variance that may further inflate observed associations. Studies using objective outcome measures — sickness absence, clinical diagnoses, physiological stress markers — are less common and tend to produce more modest effect sizes.
The literature on social stressors is methodologically stronger in some respects, with the Gerhardt et al. meta-analysis providing one of the more robust effect size estimates in the field. However, the research on optimal network structure (Sader et al.) is based on relatively small organisational samples and should be interpreted with appropriate caution about generalisability.
Cultural variation is also important. The research base is disproportionately drawn from Western, organisationally developed settings. Norms around workplace friendship, professional boundaries, and the appropriate degree of social disclosure vary significantly across cultures, and the optimal structure of colleague connection is likely context-dependent in ways the existing literature does not fully capture.
Bringing it back to The New 5-a-Day
Your People is Pillar Five — the pillar concerned with human connection across all its dimensions. Colleagues represent a specific and practically important domain: people with whom we did not necessarily choose to spend time, but who constitute a significant portion of our social environment across decades of adult life.
The research reviewed here supports several clear conclusions. First, the quality of workplace relationships has a meaningful and independent effect on health and wellbeing that is not reducible to job characteristics alone. Second, the operative variable appears to be relationship quality — particularly trust, reciprocity, and felt support — rather than relationship quantity or social activity volume. Third, social stressors in the workplace are comparably harmful to other well-documented occupational risk factors, meaning that the goal of colleague engagement should be calibrated connection rather than indiscriminate socialising. Fourth, the wellbeing benefits of colleague connection are accessible to employees across the full personality spectrum, including those who are introverted, shy, or simply prefer lower-intensity social interaction, provided that organisational conditions support autonomous and non-coercive engagement.
The practical recommendations in the Open Post — consistency over intensity, one-on-one over group, chosen over obligatory — are directly grounded in this evidence. The research does not support a model of colleague connection that prioritises visibility, social performance, or constant availability. It supports a model built around genuine warmth, modest regularity, and respect for the diverse ways in which different people engage with the social environment most effectively.
A note on medical advice: This Deep Dive is intended for readers who want to engage with the evidence in more depth. It does not replace professional medical guidance. If you are managing a health condition or are concerned about your mental health, please speak to your GP or a qualified health professional.
Want to read further? Full citations for all research referenced in this post are available in the accompanying Reference List.
The New 5-a-Day | Find Your People 5-4 | Live well. Every day.
