“If-then” planning.

Via Nine Things Successful People Do Differently:

It’s called if-then planning, and it is a really powerful way to help you achieve any goal. Well over a hundred studies, on everything from diet and exercise to negotiation and time management, have shown that deciding in advance when and where you will take specific actions to reach your goal (e.g., “If it is 4 p.m., then I will return any phone calls I should return today”) can double or triple your chances for success.