Groups rarely use the unique knowledge of their members when making decisions, focusing instead on knowledge that members have in common. This tendency to neglect the expertise of group members severely limits the effectiveness of group decision making. Previously, this problem has been addressed by showing that groups will pool task-relevant information and make effective decisions if members have knowledge of each other’s expertise. However, these studies are generally limited because they disregard why people use each other’s expertise once they are aware of it. The current study uses expectancy theory to investigate this issue and to link motivation to information exchange in groups. Results of a hidden profile study involving 40 groups indicated that expectancy motivation drives groups to use expertise awareness, exchange more unique information, and thus solve a hidden profile problem correctly.