Hooked Model (Nir Eyal)

The Hooked Model by Nir Eyal explains how products or services can create habitual use through a four-phase loop: trigger, action, variable reward, and investment. A trigger prompts the user to act, leading to a simple behavior. The action provides a reward, often unpredictable, increasing engagement. Over time, users invest more—like customizing or building a library—making future triggers more effective. This cycle reinforces habits, encouraging regular use. It's a framework used by designers and companies to build products that engage users deeply by fostering a recurring, satisfying experience.