Groupthink.

01Overview

Groupthink is conformity amplified by cohesion, insulation, and leadership pressure into a decision pathology. Janis identified it as the hidden force behind some of the worst strategic failures of the twentieth century: not irrationality of individuals, but a collective mode of thinking in which pressure for unanimity suppresses the very doubts that would catch the error. The group does not fail to think; it converges on a version of reality it is emotionally invested in maintaining.

02Key theorists

Irving Janis coined the term in his 1972 study Victims of Groupthink, analysing the Bay of Pigs invasion, the escalation of the Vietnam War, and the defensive intelligence failures around Pearl Harbor. He documented the same pattern repeatedly: small, cohesive, insulated leadership groups that congratulated themselves while filtering out inconvenient evidence — contrasted against episodes like the Cuban Missile Crisis, where deliberate adversarial deliberation produced a superior outcome.

03How it works

1. 01Illusion of invulnerability: shared optimism that breeds excessive risk-taking
2. 02Collective rationalisation: dismissing warnings and negative feedback before they are examined
3. 03Suppression of dissent: dissenting members self-censor or are directly pressured to fall in line
4. 04Illusion of unanimity: silence is read as consent, and consent is read as consensus
5. 05Self-appointed mindguards: members shield leaders from information that might disturb the project
6. 06Insulation: chronic absence of impartial outside challenge to the group's premises

04Where it shows up

High-cohesion boards ignoring existential operational risks to maintain group unanimity; press and political cabinets marching into catastrophes that outsiders could plainly foresee; executive teams where the only remaining debates are between agreeable variations of a foregone conclusion.

05The propaganda link

Directly parallels Doublethink — holding two contradictory beliefs while suppressing critical evaluation. Groupthink is Doublethink with a meeting schedule: loyalty to the collective fiction is felt as loyalty to the group itself.

06How to resist

• Institutionalise the devil's advocate and rotate the role so it never attaches to one person
• Have the leader withhold their own view until the group has evaluated the problem independently
• Use red-team and premortem exercises: assume the decision has already failed and write its obituary
• Break the group into independent subgroups that report separately before converging
• Invite outside experts with standing to challenge premises, and make sure they are heard