This document summarizes key aspects of habit formation and the HOOK model for designing habit-forming products. It discusses how habits are repetitive behaviors triggered internally or by cues in the environment. The HOOK model involves 4 steps: 1) triggers that cue users to take action, 2) a simple action or behavior, 3) variable rewards that satisfy cravings and motivate reengagement, and 4) investing small amounts of time/effort to increase engagement over time. The document provides examples of how products like LinkedIn, Cure.fit and others apply the HOOK model to form user habits.
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