Groupthink

Definition: A situation in which specific opinions or attitudes have become established within a group – for example through social conformity pressure – to the point that they are no longer questioned within the group or checked against reality.

• A group develops a shared interpretation of its environment through open discussion in which different positions were genuinely voiced and considered – spontaneous consensus formation is normal in every group and only becomes groupthink when it is solidified by group pressure and no longer matches reality.
• The group is cohesive and makes fast decisions, but dissent can still be voiced without sanctions (strong cohesion alone is not a problem).
• The term is used neutrally to describe a group dynamic (e.g., in organizational or social psychology) without implying that the group's members are incapable of independent thought.

• Interpretation patterns are solidified by group pressure rather than by evidence: dissenting opinions are no longer voiced, or are actively suppressed.
• The group has strong internal cohesion, strong sanctions against deviating opinions (especially exclusion from the group), and/or was already formed through selection effects (e.g., self-selection), so that other opinions are excluded from the start.
• The established consensus is no longer checked against reality – the group's conclusions diverge from reality, or there is no longer any mechanism to detect that.

• Origin: The term was popularized by the social psychologist Irving Janis (1972), who studied it in the context of political and organizational decision-making.
• Distinction from echo chamber: Groupthink is about social pressure within the group (cohesion, sanctions, exclusion) that suppresses dissent; an echo chamber is about an information environment in which the group only encounters opinions that confirm its own. The two often reinforce each other, but the mechanisms are different.
• Avoidance: First recognize the signs: are too few different positions represented in the group? Is there conformity pressure that causes dissent to no longer be voiced, or even to be actively suppressed? Improve precisely these points: encourage participants to voice other opinions, and stop the casual dismissal of them. Where appropriate, appoint a devil's advocate (or play that role yourself) whose task is to question precisely those self-evidences that are no longer questioned, forcing the group to critically examine its position.
• Not a fallacy: Groupthink is a systemic group dynamic, not an argumentative error committed by an individual. Pointing to it explains why a group's consensus may be unreliable – but it does not by itself refute the group's conclusions, which still have to be checked on their own merits.

• Echo chamber – both involve a group reinforcing its own opinions. Ask: is the mechanism social pressure within the group that suppresses dissent (→ groupthink), or an information environment that filters out contradicting views (→ echo chamber)?
• Circlejerking – claims are justified in a circle (A is true because B says so, B because A says so, and so on). Ask: is the problem the circular justification of claims (→ circlejerking), or the suppression of dissent that prevents anyone from breaking the circle (→ groupthink)? The two often co-occur.
• Self-aggrandizement – “We are the only ones who see the truth” is an individual's rhetorical move that implies the superiority of the in-group. Ask: is this a single rhetorical move by a speaker (→ self-aggrandizement), or a sustained pattern of unchallenged consensus within a group (→ groupthink)? The former can be a symptom of the latter.

Input: “The whole team agrees that we should skip the extra testing round – no need to delay the launch.”
Output: Consensus is not evidence. Ask how the consensus was reached: was the alternative (more testing) actually voiced and considered, or did conformity pressure – especially the fear of being seen as a blocker – suppress it? A unanimous “yes” in a tightly knit team is a warning sign, not a verification.

Input: “Everyone in this community knows that X is true – anyone who doubts it clearly doesn't belong here.”
Output: This combines groupthink (dissent is sanctioned with exclusion) with an appeal to in-group membership. The community's consensus is not a source of truth; the claim has to be checked against evidence, independent of how many people in the group hold it.

Input: “Our committee has never made a mistake, so we don't need external review this time either.”
Output: A track record of unchallenged consensus is often a consequence of groupthink, not evidence of competence – if dissent was suppressed, the group has no way of knowing whether it was right. Independent review exists precisely to break the unchallenged self-evidences.

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