Groupthink (集団思考)

Symptoms of groupthink:

Type I: Overestimations of the group — its power and morality

  • Illusions of invulnerability creating excessive optimism and encouraging risk taking.
  • Unquestioned belief in the morality of the group, causing members to ignore the consequences of their actions.

Type II: Closed-mindedness

  • Rationalizing warnings that might challenge the group’s assumptions.
  • Stereotyping those who are opposed to the group as weak, evil, biased, spiteful, impotent, or stupid.

Type III: Pressures toward uniformity

  • Self-censorship of ideas that deviate from the apparent group consensus.
  • Illusions of unanimity among group members, silence is viewed as agreement.
  • Direct pressure to conform placed on any member who questions the group, couched in terms of “disloyalty”
  • Mindguards— self-appointed members who shield the group from dissenting information.

5 thoughts on “Groupthink (集団思考)

  1. shinichi Post author



    Groupthink is a psychological phenomenon that occurs within a group of people in which the desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making outcome. Cohesiveness, or the desire for cohesiveness, in a group may produce a tendency among its members to agree at all costs. This causes the group to minimize conflict and reach a consensus decision without critical evaluation.

    Groupthink is a construct of social psychology but has an extensive reach and influences literature in the fields of communication studies, political science, management, and organizational theory, as well as important aspects of deviant religious cult behaviour.

  2. shinichi Post author




  3. shinichi Post author



    • チームの結束力は、高いパフォーマンスを発揮するチームの重要な構成要素である。
    • チームの結束が強すぎると、メンバー各人は最善のアイデアを見つけることよりも、合意を形成することのほうに集中するようになる。
    • 健全で建設的な反対意見を言う文化を醸成することは上記の問題を回避するのに役立つが、それはチーム内に心理的安全性が担保されていることが条件となる。
  4. shinichi Post author



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