Hooked: How to Build Habit-Forming Products

Eyal's practical model for building habit-forming products, based on how cues, rewards and investment shape what we do. A focused study of the SDF's Humans component — and a live case for the framework's Ethics motto, which insists on asking: habit-forming toward whose good? Nir Eyal sets out the 'Hook Model,' a four-step cycle of trigger, action, variable reward and investment that many successful products use to shape user behaviour and bring people back without relying on advertising. Drawing on his own research and consulting experience, and on examples from products including Twitter, Pinterest and the Bible App, Eyal wrote the book as the practical guide he wished he had had as a start-up founder.