Victims of Groupthink
Janis's original formulation of the concept, its symptoms, and the policy fiasco examples that made it durable.
Theory Article
Groups distort judgment before they distort the minutes
An essay on how social cost changes what gets noticed, said, and challenged long before a formal group decision is written down.
One reason social bias is dangerous is that it does not wait for the vote. It reshapes the cognitive environment while the room is still deciding what counts as a live option and what sounds sayable out loud.
The room is part of the reasoning process
A meeting is not just a place where reasoning gets reported. It is part of the environment in which reasoning happens. Who speaks first, whose status is salient, and what dissent costs all affect what finally looks like the strongest case.
That is why groupthink, authority bias, social desirability bias, and false-consensus effect often appear together rather than separately.
Why silence is not neutral
Silence can be evidence of agreement, but it can also be evidence of pressure, fatigue, hierarchy, or anticipated futility. Good teams learn to distinguish those possibilities before treating convergence as truth-tracking.
The later record of the meeting often hides this. The minutes can look calm even when the cognition in the room was socially bent.
- Consensus quality depends on dissent cost.
- Status can decide what gets challenged before evidence does.
- Independent first passes are cognitive tools, not mere etiquette.
What a site should teach about this
A bias site should therefore teach meeting structures, not just labels. Protected objection, silent first-pass notes, and explicit role rotation are not management niceties. They are debiasing devices.
If we only teach the word groupthink and never teach the room design that reduces it, we have taught the easier half of the lesson.
Empirical anchors
Theory pages are editorial synthesis. These direct sources from the related bias pages keep the larger claims tied to the underlying literature.
Behavioral Study of Obedience
Milgram's obedience work is a strong anchor for the social power of perceived authority, even when the page frames the issue as judgment rather than obedience alone.
A New Scale of Social Desirability Independent of Psychopathology
The classic measurement source behind social-desirability response tendencies in self-report.
The False Consensus Effect: An Egocentric Bias in Social Perception and Attribution Processes
The defining paper for overestimating how widely one's own choices and views are shared.
Social Categorization and Intergroup Behaviour
A classic minimal-group source for how thin group boundaries can still shape allocation and evaluation.
Related biases
Use these entry pages after the article if you want the same theory translated into more concrete diagnostic and repair tools.
Groupthink
The tendency for groups to preserve harmony, cohesion, or momentum at the cost of critical evaluation and live dissent.
Hypothesis AssessmentAssociationTeams & managementPolitics & institutions
Authority bias
The tendency to give excess weight to the opinion of a high-status or authoritative source independent of whether the source has earned that weight on the specific issue.
DecisionAssociationTeams & managementMedia & politics
Social desirability bias
The tendency to over-report socially approved attitudes or behaviors and under-report the ones likely to invite embarrassment, judgment, or sanction.
Opinion ReportingOutcomeSurveys & interviewsTeams & management
False consensus effect
The tendency to overestimate how many other people share one's own beliefs, preferences, habits, or reactions.
EstimationSelf-PerspectiveMedia & politicsTeams & management
Ingroup bias
The tendency to favor, trust, defend, or positively interpret people and claims associated with one's own group more readily than comparable outsiders.
Causal AttributionSelf-PerspectiveMedia & politicsTeams & management