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"I use the term "groupthink" as a quick and easy way to refer to a mode of thinking that people engage in when they are deeply involved in a cohesive in-group, when the members' strivings for unanimity override their motivation to realistically appraise alternative courses of action. ... Groupthink refers to a deterioration of mental efficiency, reality testing and moral judgment that results from in-group pressures." (Janis, 9)
"The failure of Kennedy's inner circle to detect any of the false assumptions behind the Bay of Pigs invasion plan can be at least partially accounted for by the group's tendency to seek concurrence at the expense of seeking information, critical appraisal, and debate. The concurrence-seeking tendency was manifested by shared illusions and other symptoms, which helped the members to maintain a sense of group solidarity. Most crucial were the symptoms that contributed to complacent overconfidence in the face of vague uncertainties and explicit warnings that should have alerted the members to the risks of the clandestine military operation-- an operation so ill conceived that among literate people all over the world the name of the invasion site has become the very symbol of perfect failure." (Janis, 48-49.)
"What starts out as rational is likely to become less so over time. And accidents that would not matter much in normal times or early in a crisis might create 'crazy' situations in which choice is so constrained that 'rational' decisions about the least bad alternatives lead to outcomes that would appear insane under normal circumstances." (Allison, 214)