Groupthink

Groupthink occurs when the pressure to maintain cohesion and consensus within a group leads its members to stop thinking critically. Dissenting views go unspoken, alternatives go unexamined, and the group develops an illusion of unanimity and of being right. Symptoms include self-censorship, pressure on doubters, an overestimation of the group’s judgement, and the emergence of self-appointed “mindguards” who shield the group from inconvenient information.

The term was coined by psychologist Irving Janis, who studied how capable groups made catastrophic decisions. Groupthink is most likely in cohesive groups with strong, directive leadership, insulation from outside views, and high pressure to decide. It is distinct from the Abilene Paradox: in groupthink, members genuinely come to believe the group’s position and suppress doubt to preserve harmony, whereas in the Abilene Paradox they privately disagree but cannot tell that others do too.

In hiring and leadership, groupthink shows up in homogeneous interview panels and echo-chamber leadership teams. A panel whose members share the same background and defer to a dominant voice may converge quickly on a candidate without genuinely testing the decision — and may screen out anyone who does not fit an unspoken mould. The defences are structural: diverse panels, independent scoring collected before discussion, an explicitly invited devil’s advocate, and leaders who withhold their own view until others have spoken. This is one of the practical arguments for diversity on hiring panels and leadership teams — a range of perspectives makes unchallenged consensus far harder to reach.