MENTAL MODEL · M3296

Köhler Effect

BehaviormediumPsychology

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Updated 2026-08-01

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INTRODUCTION

English translation pending.

CORE DEFINITION

Named after Otto Kohler, who in the 1920s observed that rowers performing in pairs or teams sustained more effort than when working alone. The effect appears when a member perceives their own contribution as decisive for the group and, particularly when they are the weakest link, works harder to avoid letting others down. It runs opposite to social loafing, where individuals reduce effort because their contribution cannot be identified. The effect depends on task structure and perceived responsibility.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Weak-link design: structure the task so the weakest link determines the outcome. - Responsibility signal: make each person's contribution visible and consequential to the group. - Anti-loafing check: use interdependence to counter the diffusion of collective effort in teams.

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When individual output is identifiable and decisive, accountability replaces diffusion of responsibility. The weaker member works harder to avoid being the cause of group failure, driven by felt obligation to teammates and concern for self-image, so effort rises above the solo baseline.

MINIMUM ACTION

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Practice this model in one real situation:

Design tasks where the weakest link determines the outcome, as in a relay. 2. Bind weaker members with stronger ones so their role is visible. 3. Make each person's effect on the group result explicit. 4. Ensure weaker members are genuinely needed, not sidelined.

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Source support: Explicit

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baike.baidu.comhttps://baike.baidu.com/item/科勒效应ZH · Explicit
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