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Hooked by Nir Eyal: Summary and Notes
A product or service is considered successful if users come back without the need for costly advertisement or aggressive messaging.

“All humans are motivated to seek pleasure and avoid pain, to seek hope and avoid fear, and finally, to seek social acceptance and avoid rejection.”
Rating: 8/10
Related: Zero to One, Inspired: How to Create Tech Products Customers Love, The Lean Product Playbook: How to Innovate with Minimum Viable Products and Rapid Customer Feedback
Hooked Short Summary
Hooked by Nir Eyal is a book that explains how tech companies get people to use their products repeatedly. User habits are explained by the Hook Model which consists of four looping cycles: trigger, action, variable reward, and investment. The Hook is an excellent book that explains user behavior towards technological products and services.
The Hook Model
The Hook Model explains the four-phase process that companies use to form habits.
The four phases are: trigger, action, variable reward, and investment.

For companies, the desire is to achieve the goal of unprompted user engagement with their products.
A product or service is considered successful if users come back without the need for costly advertisement or aggressive messaging.
The Habit Zone
Habits are one of the ways the brain learns complex behavior. Habits give us the ability to shift our focus to other things because most habits are automatic responses.
User habits are good for business because they create unprompted user engagement.
For example:
Most people readily open the Facebook app on their phone without the need for advertisement or reminder from Facebook. Their behavior is…