... of Theory in Health Promotion and Health Behavior 3 PART 1 THEORY AT A GLANCE 4 Why Is Theory Important to Health Promotion and Health Behavior Practice? Effective public health, health ... of explanatory theories include the Health Belief Model, the Theory of Planned Behavior, and the Precaution Adoption Process Model. Change theory guides the development of health interventions. ... of explanatory theories include the Health Belief Model, the Theory of Planned Behavior, and the Precaution Adoption Process Model. Change theory guides the development of health interventions....