Illusions of unanimity is considered to be a symptom of groupthink.

Question

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Illusions of unanimity occur when group members mistakenly believe that everyone in the group agrees with the decision or position taken by the group, even though some members may have concerns or objections. This phenomenon is closely related to groupthink, a pattern of dysfunctional decision-making in which members of a group prioritize consensus and harmony over critical evaluation of alternative viewpoints.

Illusions of Unanimity Is Considered to Be a Symptom of Groupthink