As an alternative to Janis'model, Baron proposes a ubiquity model of groupthink.
From the en.wikipedia.org
Janis offered the 1961 Bay of Pigs Invasion as a historical case of groupthink.
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The attack on Pearl Harbor on December 7, 1941 was a prime example of groupthink.
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These findings refute Janis'claim about group cohesiveness predicting groupthink.
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This phenomenon is called group homogeneity, which is an antecedent to groupthink.
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And with any robust community, there's the danger of succumbing to groupthink.
From the techcrunch.com
Groupthink is a psychological phenomenon that occurs within groups of people.
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Instead, they often opt to measure particular factors of the groupthink phenomenon.
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I agree that diversity can sometimes help in staving off stagnation and groupthink.
From the economist.com
More examples
Decision making by a group (especially in a manner that discourages creativity or individual responsibility)
Groupthink is a type of thought within a deeply cohesive in-group whose members try to minimize conflict and reach consensus without critically testing, analyzing, and evaluating ideas. It is a second potential negative consequence of group cohesion.
A process of reasoning or decision-making by a group, especially one characterized by uncritical acceptance or conformity to a perceived majority view
This is the effect when a group works together and is sufficiently similar either by group membership or by training that they "think as one". ...
Process where members of a group start thinking alike and there are less individual ideas and creativity.
The tendency for decision making groups to reach a conclusion that is extreme and which tend to be unwise or unrealistic, as a result of discounting information that is inconsistent with their view and expressing disapproval against any member who disagrees.
The forces that tend to suppress or resist divergent thinking when a group is working to accomplish a specific task within a limited period of time.
A group communication process where high group cohesiveness impairs decisions by stimulating premature closure on important issues. ...
The tendency to make decisions intended primarily to promote the harmony of the group