Factor 3: Rules

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Rules keep the discussion on-track.

Quantity not quality. Quantity not quality. Stopping to filter for quality will stop idea generation.
Unusual is good. Go for the disruptive, counter-intuitive and unexpected.
No criticisms. No playing devil's advocate. Drop the black hat.
Don't censor. Don't censor yourself or others. There is no right or wrong. Anything is possible.
Go with the flow. Build-on every idea by combining, improving or changing it.