「組織と人数」の絶対法則
人間関係を支配する「ダンバー数」のすごい力
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「組織と人数」の絶対法則
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この数字からは誰も逃れられない！
「友だちの数」「生産性の高いチームのメンバー数」「縦割り化する会社の社員数」
カギを握るのは、進化がもたらした「社会脳」だ！
強力なチームに共通する「ルール」とは？
信頼や絆を深めるための秘策とは？
進化心理学が導く科学的組織論。
世界中のあらゆる場所で見られる、
社会的なネットワークの典型的なサイズを示す
ダンバー・グラフの人数：
5人
もっとも親しい友人の数。
迅速に決断を下すことができ、
結果を出すことが重視されるチームに最適な人数。
15人
親友の数。
多様な情報源とアイデアに恵まれる、
ブレインストーミングに適したグループの人数。
50人
良好な関係の友人の数。
何らかのリーダーシップを必要とせずに、
民主的に運営できる集団の最大の人数。
150人
友人の数（ダンバー数）。
この人数を超えると「内集団」と「外集団」に分かれてしまい、
互いに対する信頼が薄れる。©2023 Tracey Camilleri, Samantha Rockey, Robin Dunbar (P)2025 Audible, Inc.
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