Groupthink

Groupthink (Irving Janis, 1972) names a cohesive decision group’s drift toward unanimity at the expense of realistic judgment: members suppress doubt, stereotype outsiders, and treat silence as agreement. The group feels aligned; tier on the underlying claims is never examined honestly.

It is a group-level bias pattern — distinct from but often reinforced by consensus culture, which institutionalises “no action until everyone is comfortable.”

Classic symptoms (Janis)

• Illusion of invulnerability — excessive optimism; risk downgraded.
• Collective rationalisation — warnings dismissed; contrary evidence not sought.
• Stereotyping out-groups — critics treated as ignorant or hostile (heterophobia at the boundary).
• Self-censorship — members withhold doubts to preserve harmony.
• Illusion of unanimity — silence read as consent.
• Mindguards — some members shield the group from upsetting information.

Sound familiar in software and strategy rooms: the roadmap meeting where no one names the fatal assumption; the postmortem where everyone “always knew” but nobody committed it at L0 before the outage.

Epistemic failure

Groupthink is Innovation Divide in committee form: appetite for alignment masquerades as shared judgment on how strong the claim is. It stacks with homophilic closure — only similar voices count — and produces homophilic dismissal of Cassandras and out-group experts.

Judgment infrastructure counters it by:

• Named authority at the commitment boundary — someone commits at stated tier, not “the room.”
• Explicit dissent capture — objections recorded at honest tier before bind, not buried in meeting notes.
• Cross-cluster review — heterophilous input required before consequential commits.

Groupthink vs consensus culture

Both fail commitment requires authority when comfort replaces accountable bind.

Corpus stance

A2 — working context: Standard organisational-psychology lens for collective epistemic failure; complements Rogers/Moore adoption vocabulary without replacing tier discipline. We cite Janis as attribution for the named syndrome, not as epistemic canon.

Related adoption concepts

Groupthink can distort how a team reads its position on an Innovation S-curve — unanimous optimism about “we’re crossing the chasm” when the chasm analysis says otherwise. Separate social unanimity from evidence at tier.