We rely on other people’s ideas because they often know more than we do about many aspects of the world. A negative consequence of shared beliefs occurs when people focus too much on information that originates from people who hold the same opinions. A group is particularly vulnerable to groupthink when its members have similar backgrounds, the group is insulated from outside opinions, and there are no clear rules for decision making. Shared beliefs can nonetheless contribute to group cohesion, coordination of ideas, and shared mental models. The flipside of shared beliefs are unshared beliefs that can cause conflicts. Advice for resolving conflicts includes engaging in persuasive listening, acknowledging common ground, and discussing reasons for a lack of progress. Considering alternative perspectives also broadens views. High levels of task discourse enable team members to resolve ambiguities, refine their ideas, and discuss the potential innovation of those ideas. Training should therefore emphasize a diversity of perspectives, the open exchanges of ideas, the reduction of biases, and an increased motivation for accuracy.