Assess graduate students' understanding of three foundational health behavior change models—Health Belief Model, Theory of Planned Behavior, and Transtheoretical Model—by asking them to identify and define each model's core constructs (e.g., perceived susceptibility/severity/benefits/barriers; attitudes, subjective norms, perceived behavioral control; stages of change, processes of change) and to explain key distinguishing features such as theoretical mechanisms, temporal focus, and common intervention applications.