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Psychol Sci. 2013 Jun;24(6):880-90. doi: 10.1177/0956797612463082. Epub 2013 Apr 10.

Group heterogeneity increases the risks of large group size: a longitudinal study of productivity in research groups.

Author information

1
Fuqua School of Business, Duke University, USA.

Abstract

Heterogeneous groups are valuable, but differences among members can weaken group identification. Weak group identification may be especially problematic in larger groups, which, in contrast with smaller groups, require more attention to motivating members and coordinating their tasks. We hypothesized that as groups increase in size, productivity would decrease with greater heterogeneity. We studied the longitudinal productivity of 549 research groups varying in disciplinary heterogeneity, institutional heterogeneity, and size. We examined their publication and citation productivity before their projects started and 5 to 9 years later. Larger groups were more productive than smaller groups, but their marginal productivity declined as their heterogeneity increased, either because their members belonged to more disciplines or to more institutions. These results provide evidence that group heterogeneity moderates the effects of group size, and they suggest that desirable diversity in groups may be better leveraged in smaller, more cohesive units.

KEYWORDS:

performance; social interaction; social structure

PMID:
23575599
DOI:
10.1177/0956797612463082
[Indexed for MEDLINE]

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