Osborn's Brainstorming Rules
Updated 2026-08-05
INTRODUCTION
English translation pending.
CORE DEFINITION
A discipline for group idea generation set out by advertising executive Alex Osborn in the 1940s and later formalized in his book Applied Imagination. It rests on four rules: defer criticism until later, welcome far-fetched ideas, pursue quantity as a route to quality, and combine or improve on ideas already on the table. The rules are procedural constraints rather than a technique, and they apply only to the divergent phase. Evaluation is deliberately moved to a separate stage so that generation and judgment never run at the same time.
SCAFFOLDING EFFECT
Reduce cognitive load
- Creative Flow Protection: stop the first critical remark, which kills fragile early ideas fastest. - Divergence Discipline: keep generation and evaluation in separate blocks with different rules. - Volume Target: set an explicit idea count so the group pushes past obvious answers.
Anchor fast decisions
Two forces suppress group creativity: evaluation apprehension, where people withhold ideas to avoid looking foolish, and production blocking, where only one person can speak at a time. Deferring judgment removes the first, while building on others' ideas turns a serial process into a compounding one. Quantity helps because unusual combinations are rare, so raising the total raises the chance of hitting a genuinely novel option. The rules work as a temporary social contract that suspends ordinary status and criticism norms.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Brainstormingverified
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