Hook Model vs. Four Forces
The key distinction between Nir Eyal's habit-formation framework (Trigger→Action→Reward→Investment) and the JTBD Four Forces model that explains why people actually switch.
The Hook Model and the Four Forces address different moments in the user journey. The Hook Model explains how products form habits through a loop of trigger, action, variable reward, and investment. It is excellent for retention and daily engagement. The Four Forces explain why someone switches from one solution to another: Push (frustration with the current way), Pull (attraction of the new way), Habit (inertia of the old way), and Anxiety (fear of the new way). A product can be perfectly "hooked" and still lose to a competitor if the Four Forces equation favors switching. Products need both: the Hook Model to create stickiness after adoption, and the Four Forces to win the adoption decision in the first place.