23 | Interrupt & replace
Spot unwelcome actions early and channel it somewhere better.
Lever: Add friction3
Make risky or impulsive actions harder to take. Use when: + Barrier is “too easy for bad” (e.g. impulse clicks, harmful defaults) + You want to slow down or block knee-jerk decisions
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21 | Commit to begin
Secure an early 'yes' that carries them through the hard middle.
15 | Penalise
Make the cost hit fast, so a behaviour doesn’t repeat.