The first model used to understand health behavior is The Theory of Planned Behavior (TPB) extended from the Theory of Reasoned Action. The TPB is an interventional plan to help implement effect of the programs designed to solve a specific behavior. It has the relationship between attitudes and behavior. It is used to study human behavior and develop appropriate interventions to predict and understand healthy behaviors, unhealthy behaviors as well as the results of their behavior. These concept models including specific behaviors such as intentions, attitudes, subjective norms, and attitude control are realized as a combination of social factors and personal factors. Health behavior predicts the best start for the willingness of a person to
