The authors consider a production function that transforms inputs into outputs through peer effect networks. The distinguishing features of this model are that the network is formal and observable through worker scheduling, and selection into the network is done by a manager. The authors discuss identification and suggest several estimation techniques. They tackle endogeneity arising from selection into groups and exposure to common group factors by employing a polychotomous Heckman-type selection correction. They illustrate their method using data from the Syracuse University Men’s Basketball team, where at any time the coach selects a lineup and players interact strategically to win games.