The dangerous drive to agree: why cohesive groups often make irrational decisions
In short: When a group prioritizes harmony over critical evaluation, the result is often a failure of logic. This psychological phenomenon, known as groupthink, can cause even highly competent individuals to ignore their own senses and accept a consensus that is demonstrably wrong.
Groupthink occurs when the desire for group cohesion leads members to prioritize consensus over the pursuit of an optimal or valid decision. In these scenarios, individuals may minimize conflict to maintain harmony, effectively bypassing the critical evaluation necessary for sound decision-making. This can manifest as simple compliance—changing outward behavior to match a norm—or deeper acceptance, where an individual's private beliefs actually shift to align with the group.
Psychological research highlights two primary drivers for this behavior: the desire to be accepted by others and the desire to hold an accurate perception of reality. When tasks are ambiguous or when an individual doubts their own competence, they often look to the group for social testing. This 'informational influence' can lead to a convergence of judgments, where a group develops a collective norm that persists even when individuals are later tested privately.
Classic experiments have demonstrated the strength of this pressure. In the 1930s, Muzafer Sherif showed that people's perceptions of light movement could be permanently altered by group norms. Later, Solomon Asch demonstrated that people would frequently provide clearly erroneous answers—such as misjudging the length of a line—simply because a unanimous majority of confederates provided the wrong response. While many participants resisted, roughly one-third of Asch's subjects conformed to the incorrect majority on approximately one-third of the trials.
The term was popularized by William H. Whyte Jr. in 1952, drawing inspiration from George Orwell's 'Nineteen Eighty-Four'. Later, Yale psychologist Irving Janis applied the concept to historical failures, such as the 1941 attack on Pearl Harbor and the 1961 Bay of Pigs Invasion, to illustrate how collective decision-making can lead to disastrous outcomes.
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Sources
- Summary by Intellect · source: Groupthink | Psychology, Decision-Making & Consequences | Britannica
- Also: Groupthink
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