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Builds on the Theory of Reasoned Action by adding the component of perceived behavioral control. Used to deal with behaviors over which people have incomplete voluntary control.

Outlines the stages of precontemplation, contemplation, preparation, action, and maintenance. Facilitates tailored health communication based on an individual's readiness to change.

Emphasizes the role of intention in behavior change, determined by an individual's attitude toward the behavior and subjective norms. Used to design interventions that can change attitudes and norms influencing health behaviors.

Key components include perceived susceptibility, perceived severity, perceived benefits, perceived barriers, cues to action, and self-efficacy. Used to predict and explain health behaviors by focusing on individual beliefs.

Stipulates that health behavior change is a function of information, motivation, and behavioral skills. Often utilized in interventions to prevent HIV and other sexually transmitted infections.

Focuses on how new ideas, practices, and technologies spread within a culture. Key factors include the innovation itself, communication channels, the social system, and time. Applied to promote the adoption of healthy behaviors.

Consists of a motivational phase leading to intention formation and a volitional phase leading to action. Emphasizes self-efficacy, risk perception, and outcome expectancies in the process of health behavior change.