This document presents a new model called the Fogg Behavior Model (FBM) for understanding human behavior. The FBM asserts that for a behavior to occur, a person must have sufficient motivation, ability, and be triggered to perform the behavior all at the same time. It identifies motivation, ability, and triggers as the three key factors that influence behavior. The document describes each factor and how they interact using an example of getting users to sign up for a newsletter. It explains that motivation and ability can trade off, so high motivation may compensate for low ability, or high ability can compensate for low motivation, depending on the situation.