Hooked… how to build habit-forming products… by Nir Eyal, an entrepreneur on a mission to discover what makes certain startups an integral part of pop culture.
Years of studying successful startups led to insights about influencing consumer behavior. And then, these insights were codified in the Hook model: a cycle of events, engineered to keep users coming back.
The Hook cycle consists of 4 stages: trigger, action, variable reward, and investment.