One‑line habit plan on a calendar: I will [behavior] at [time] in [location].

Most new habits fail because we never decide when and where we’ll act. Chapter 5’s solution is tiny and powerful: the one‑line plan known as an implementation intention — “I will [behavior] at [time] in [location].” This article explains why it works and gives easy, real‑life examples and a 2‑minute starter.