The assignment content discusses the three theories of health behavior: Attitudes, Behavioral Intention, Subjective Norms, Social Norms, Perceived Power, and Perceived Behavioral Control. These theories influence risky behavior and encourage healthy behavior. The Health Belief Model is used in HIV prevention and weight control, while the Theory of Planned Behavior is used in retrospective analysis of health behavior and eating behavior. The Transtheoretical Model is applied to smoking behavior and sexually transmitted disease. The main goal of all three theories is to change health behavior towards healthier behavior.