From Hooked

What are you really building?

Habit-forming is not the same as good. The Manipulation Matrix asks two honest questions and shows you the ethics of what you are making. Move the sliders and watch where you land.

Would I use this product myself? 70%

Does it materially improve users' lives? 70%

Facilitators use their own product and improve users' lives. Dealers do neither. The two questions are Nir's original test for ethical, habit-forming design.