Nir Eyal does not for a second regret writing Silicon Valley's tech engagement how-to, "Hooked: How to Build Habit-Forming Products," even as he now has a new book out on how to free ourselves of that same addiction.

In his original manual for building enthralling smartphone apps, Eyal laid out the tricks "to subtly encourage customer behavior" and "bring users back again and again." He toured tech companies speaking about the Hook Model, his four-step plan to grab and keep people with enticements like variable rewards, or pleasures that come at unpredictable intervals.

"Slot machines provide a classic example of

Advertisement
Advertisement