Ideate — generate options before judging

Produce many candidate solutions, deferring evaluation until you have quantity.

Why it works

Generating and judging at the same time chokes idea flow: the moment you evaluate, you stop producing. Separating ideation from selection lets quantity surface the non-obvious option that judgment would have killed early. The mechanism is protecting divergent thinking from premature convergence.

How to do it

1. Set a quantity target (e.g. 30 ideas in 15 minutes) so volume, not quality, is the goal.
2. Defer all criticism — capture even bad ideas, which often trigger good adjacent ones.
3. Only after the timer ends, switch modes and cluster and select.

Evidence

Mechanistic for the stage as a whole, with a real caveat from research: separating generation from evaluation helps, but group brainstorming as usually run underperforms the same people ideating alone and pooling results. A meta-analytic integration across brainstorming studies confirms this productivity loss is a robust, replicated effect rather than an isolated finding. (mechanistic)

Decades of research find face-to-face group brainstorming produces fewer and no-better ideas than individuals working separately (production blocking, social loafing, evaluation apprehension). Ideate alone first, then combine.

Sources

• Diehl, M., & Stroebe, W. (1987). Productivity Loss in Brainstorming Groups: Toward the Solution of a Riddle. Journal of Personality and Social Psychology, 53(3), 497-509.
• Mullen, B., Johnson, C., & Salas, E. (1991). Productivity Loss in Brainstorming Groups: A Meta-Analytic Integration. Basic and Applied Social Psychology, 12(1), 3-23.

Common mistake

Running ideation as a live group free-for-all, where the loudest voice anchors everyone and quiet, often-better ideas never surface. Individual generation first beats it.