GroupThink is promoted by the following:
1. Illusion of Invulnerability
2. Collective Rationalization
3. Unquestioned Belief in Morality
4. Disparage Opponents
5. Conformity pressure
6. Self-censorship
7. Illusion of unanimity
8. Mindguards 

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M. Foster (2000) Course notes for Psycology 361 University of North Dakota, http://www.und.nodak.edu/instruct/mfoster/slc8.htm
Downloaded May 15th 2002.