Hooked: How to Build Habit-Forming Products

by Nir Eyal

imperative

unprecedented

Viral Cycle Time.”9 Viral Cycle Time is the amount of time it takes a user to invite another user, and it can have a massive impact.

Products that change customer routines are less susceptible to attacks from other companies.

scratch the user’s itch.

soothe

This study demonstrates how perception can form a personal reality based on how a product is framed, even when there is little relationship with objective quality.

endowed progress effect or the scarcity effect to increase the likelihood of a desired user behavior.

cognitive biases