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17: Groupthink

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    Learning Objectives

    • Define groupthink.
    • Define the four-level factors.

    17.1 Overview of Groupthink

    A line of identically dressed stormtroopers from the Star Wars films. One stormtrooper is stepping out of formation and looking at the others in the group.
    Groupthink helps us blend in and feel accepted and validated but it can also lead to problems. [Image: CC0 Public Domain,]

    Groups sometimes make spectacularly bad decisions. In 1961, a special advisory committee to President John F. Kennedy planned and implemented a covert invasion of Cuba at the Bay of Pigs that ended in total disaster. In 1986, NASA carefully, and incorrectly, decided to launch the Challenger space shuttle in temperatures that were too cold.

    Irving Janis (1982), intrigued by these kinds of blundering groups, carried out a number of case studies of such groups: the military experts that planned the defense of Pearl Harbor; Kennedy’s Bay of Pigs planning group; the presidential team that escalated the war in Vietnam. Each group, he concluded, fell prey to a distorted style of thinking that rendered the group members incapable of making a rational decision. Janis labeled this syndrome groupthink: “a mode of thinking that people engage in when they are deeply involved in a cohesive in-group when the members’ strivings for unanimity override their motivation to realistically appraise alternative courses of action” (p. 9).

    Janis identified both the telltale symptoms that signal the group is experiencing groupthink and the interpersonal factors that combine to cause groupthink. To Janis, groupthink is a disease that infects healthy groups, rendering them inefficient and unproductive. And like the physician who searches for symptoms that distinguish one disease from another, Janis identified a number of symptoms that should serve to warn members that they may be falling prey to groupthink. These symptoms include overestimating the group’s skills and wisdom, biased perceptions and evaluations of other groups and people who are outside of the group, strong conformity pressures within the group, and poor decision-making methods.

    Janis also singled out four group-level factors that combine to cause groupthink: cohesion, isolation, biased leadership, and decisional stress.

    • Cohesion: Groupthink only occurs in cohesive groups. Such groups have many advantages over groups that lack unity. People enjoy their membership much more in cohesive groups, they are less likely to abandon the group, and they work harder in pursuit of the group’s goals. But extreme cohesiveness can be dangerous. When cohesiveness intensifies, members become more likely to accept the goals, decisions, and norms of the group without reservation. Conformity pressures also rise as members become reluctant to say or do anything that goes against the grain of the group, and the number of internal disagreements—necessary for good decision making—decreases.
    • Isolation. Groupthink groups too often work behind closed doors, keeping out of the limelight. They isolate themselves from outsiders and refuse to modify their beliefs to bring them into line with society’s beliefs. They avoid leaks by maintaining strict confidentiality and working only with people who are members of their group.
    • Biased leadership. A biased leader who exerts too much authority over group members can increase conformity pressures and railroad decisions. In groupthink groups, the leader determines the agenda for each meeting, sets limits on discussion, and can even decide who will be heard.
    • Decisional stress. Groupthink becomes more likely when the group is stressed, particularly by time pressures. When groups are stressed they minimize their discomfort by quickly choosing a plan of action with little argument or dissension. Then, through collective discussion, the group members can rationalize their choice by exaggerating the positive consequences, minimizing the possibility of negative outcomes, concentrating on minor details, and overlooking larger issues.

    17.2 Additional Resources

    Check out this reading concerning groupthink during the Mount Everest disaster.

    Burnette, J. L., Pollack, J. M., & Forsyth, D. R. (2011). Leadership in extreme contexts: A groupthink analysis of the May 1996 Mount Everest disaster. Journal of Leadership Studies, 4(4), 29-40. doi:10.1002/jls.20190


    Forsyth, D. R. (2020). The psychology of groups. In R. Biswas-Diener & E. Diener (Eds), Noba textbook series: Psychology. Champaign, IL: DEF publishers. Retrieved from

    Burnette, J. L., Pollack, J. M., & Forsyth, D. R. (2011). Leadership in extreme contexts: A groupthink analysis of the May 1996 mount Everest disaster. Journal of Leadership Studies, 4(4), 29-40. doi:10.1002/jls.20190


    Adapted from The Psychology of Groups by Donelson R. Forsyth under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

    This page titled 17: Groupthink is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by Whitney Sarah Payne.

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