Antecedent & Symptoms

Antecedent conditions
1. High cohesiveness
2. Insulation of the group
3. Lack of methodical procedures for search and appraisal
4. Directive leadership
5. High stress with low degree of hope for finding better solutions than the one favored by the leader or other influential persons

Symptoms of groupthink
1. Illusion of invulnerability
2. Collective rationalization
3. Belief in inherent morality of the group
4. Stereotypes of outgroups
5. Direct pressure on dissenters
6. Self-censorship
7. Illusion of unanimity
8. Self-appointed mind guards

Symptoms of defective decision making
1. Incomplete survey of alternatives
2. Incomplete survey of objectives
3. Failure to examine risks of prefered choice
4. Poor information search
5. Selective bias in processing information at hand
6. Failure to reappraise alternatives
7. Failure to work out contingency plans

(isn't that hilarious!)