When a group is under pressure, extremely cohesive, and the leader is diplomatic, groupthink is most likely to happen.
In a decision-making group, groupthink is "the pattern of thinking that results when the desire for harmony trumps a realistic appraisal of options." A case of groupthink was when NASA allowed the Challenger Space Shuttle to launch despite knowing that it would not succeed.
Groupthink is more likely to happen when a group is extremely cohesive, isolated from opposing viewpoints, headed by a decisive figure who makes his or her wishes clear, and using techniques such faulty decision-making techniques under pressure.
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