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Most evidence from 13 studies we examined suggests that collaboration between friends supports cognitive performance. Superior performance has been demonstrated on a variety of tasks including seeking scarce resources, problem solving, creative activity, and reaching consensus in discussion. Based mostly on observations in 2-person settings, current studies demonstrate the benefits that can occur when friends, as compared with nonfriends, are co-workers on cognitive tasks. Teachers must frequently base organizational decisions in the classroom on competing options but should consider giving friends the opportunity to work together as often as possible.
Zajac et al. (Mon,) studied this question.