Making Habits, Breaking Habits: Why We Do Things, Why We Don't, and How to Make Any Change Stick

Say you want to start going to the gym or practicing a musical instrument. How long should it take before you stop having to force it and start doing it automatically?

The surprising answers are found in Making Habits, Breaking Habits, a psychologist's popular examination of one of the most powerful and under-appreciated processes in the mind. Although people like to think that they are in control, much of human behavior occurs without any decision-making or conscious thought.

Drawing on hu...