4 phases that create habit-forming products. Score your store on Triggers, Actions, Variable Rewards, and Investment — then close the gaps.
A one-time purchase is nice. A customer who comes back on autopilot is a business. Nir Eyal's Hook Model maps the four phases that turn first-time buyers into repeat customers: Trigger, Action, Variable Reward, and Investment. Work through each phase and check off what your store already does.
Source: Nir Eyal's "Hooked: How to Build Habit-Forming Products."
Triggers prompt the user to take action. External triggers are delivered by the environment; internal triggers are associations stored in the customer's memory.
The action is the simplest behavior done in anticipation of a reward. The easier the action, the more likely it happens.
Variable rewards create desire. The unpredictability of the reward — not the reward itself — is what hooks customers.
Investment is the phase where users put something in — time, data, effort, social capital — that makes the next cycle more likely.
Your Hook Model score
Check off each item as you audit your store. Your score updates in real time.
The Hook Model is a four-phase cycle — Trigger, Action, Variable Reward, Investment — that explains how products create habits. For ecommerce, a complete Hook cycle means customers return without being reminded, buy without hesitation, and become harder to poach by competitors. Each broken phase weakens the entire loop.
Start with Trigger and Action. If customers are not being prompted to return (weak triggers) or the buying process is too difficult (weak action), the later phases never get a chance to work. Variable Reward and Investment only matter once people are actually showing up and completing purchases.
A CRO audit optimizes individual transactions — getting more visitors to buy once. The Hook Model optimizes for repeat behavior — getting buyers to come back unprompted. CRO fixes your funnel; the Hook Model builds a cycle. Both matter, but most stores only do the first.
No. Aim for at least 4 out of 6 in each phase (67%+) so no single phase is a dead link. A chain breaks at its weakest point — one strong phase cannot compensate for another that scores zero. Balance across all four phases matters more than a perfect total score.
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