The impact of congruence between social and knowledge ties on performance in diverse groups was examined. Congruence occurs when group members who are socially tied share the same information and a stranger has any unique information. Incongruence occurs when group members who are socially tied possess different information, and one of them shares information with a stranger. In Experiment 1, three-person groups with congruent social and knowledge ties utilized information more effectively, reported more effective group processes, and outperformed groups with incongruent ties. Experiment 2, which involved four-person groups, examined the role of congruence in groups with either a single minority information holder or two equal-sized subgroups. Congruent groups again outperformed incongruent groups, but this was only true when groups had a minority information holder. There was no difference in the performance of congruent and incongruent groups that had equal-sized subgroups. The implications of these findings for analyses of group composition and decision-making are discussed.