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____ is a negative group phenomenon characterized by a lack of critical evaluation of proposed ideas or courses of action that results from high levels of cohesion and/or high conformity pressures.

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Answer:Groupthink

Explanation:

It was postulated by the Psychologist called Irving Janis in 1972. Groupthink is when individuals come together to make certain decisions collectively while discarding their personal beliefs and making sure there is no form of dissent. This decisions however may not be the best or optimally efficient.