Many organizations rely on teamwork, and yet field evidence on the impacts of team-based incentives remains scarce. Compared to individual incentives, team incentives can affect productivity by changing both workers’ effort and team composition. This paper by Bandiera, Barankay and Rasul (Journal of the European Economic Association, October 2013) presents evidence from a field experiment designed to evaluate the impact of rank incentives and tournaments on the productivity and composition of teams.