Groupthink & Decision-Making Under Pressure

A group of genuinely capable, well-intentioned people can still make a catastrophically wrong decision together — not from stupidity, but from a real, named psychological pattern that overrides individual judgment. This chapter covers that pattern, and the real, tragic case that remains its most-studied example.

Groupthink: A Real, Named Concept

Psychologist Irving Janis coined the term "groupthink" in his real 1972 book Victims of Groupthink, defining it as a mode of thinking that emerges in a cohesive group when the drive for unanimous agreement overrides members' genuine motivation to realistically weigh alternatives. He identified eight real, recurring symptoms — including several directly visible in the case below.

A Real, Tragic Case

Roger Boisjoly, an engineer at Morton Thiokol — the company that built the Space Shuttle's solid rocket boosters — wrote a real memo roughly six months before the Challenger launch, warning that cold temperatures could cause O-ring failure and "a catastrophe of the highest order — loss of human life."

The Challenger case maps directly onto Janis's own real symptoms: an illusion of invulnerability (previous flights had survived similar risks without incident), and unmistakable direct pressure on a dissenting engineering judgment — the literal instruction to switch from an engineer's own risk assessment to a manager's schedule-driven one.

Hands-On Exercises