Diagnostic question · Hooked
Unprompted sessions by tenure
Measures the share of sessions with no external trigger, by tenure, the behavioral proxy for an internal trigger.
Return
Plain label: unprompted share question
What share of sessions start with no external trigger, and does that share rise the longer users stay?
Limits
What we don’t claim
- The Hook Model is a practical design tool, not a validated or complete theory of behavior.Hooked, Introduction
- Habit metrics need the longer habit horizon (weeks to months) before they can be read.
Sources
Hooked · Nir Eyal
Ch.2
Source IDs: HK-Q23
Book content is paraphrased, never quoted at length. Last verified October 24, 2026.
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