
Business
Hooked
Nir Eyal
4.1 (62000) 8 min read 5 key ideas
A behavioral design framework explaining how products build user habits through a repeatable cycle of trigger, action, variable reward, and investment.
Key takeaways
- Habit-Forming Products Follow a Predictable Hook Cycle
- External and Internal Triggers Initiate the Habit Cycle
- Variable Rewards Create Anticipation-Driven Engagement
- User Investment Increases Future Engagement Likelihood
- Ethical Considerations Should Guide the Application of Habit-Forming Design
Action checklist
- Map your product's hook cycle today: trigger, action, variable reward, investment
- Add one small user investment (data, content, effort) that increases future engagement
Final takeaway
Eyal's closing invitation: apply the Hook Model's four stages — trigger, action, variable reward, investment — while explicitly considering whether the resulting habitual engagement genuinely serves users' authentic interests, using this ethical consideration to distinguish responsible habit-formation design from merely exploitative engagement-maximization.
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