Is groupthink an advantage or disadvantage to decision-making? Explain your answer.

Groupthink is a major disadvantage to team decision-making. Because the team members are more concerned with preserving harmony in the group than with risking opinions that may cause conflict or offense. Being in this kind of group confers an illusion of immunity, an "us against the world" view that the group members know better than outsiders, even given evidence to the contrary. Without any dissenting voices within a team, nothing will ever change because they will think that every decision they make is the right one.