Groupthink
This image outlines the requirements, symptoms, and defects of groupthink in detail. Groups must be cohesive, insulated, lack an impartial leader, and homogenous, as well as be in a provocative, high stress situation, in order for groupthink to occur.
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"Groupthink schematic."
http://commons.wikimedia.org/wiki/File:Groupthink_schematic.JPG
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