Theory is important for good health promotion practice because it provides a framework for understanding the underlying causes of health behaviors and the factors that influence them. By using theory, health promotion practitioners can develop effective interventions that are based on evidence and are more likely to be successful in changing behavior. Theory can also help practitioners identify the most appropriate target audience for their interventions and the most effective strategies for reaching that audience. In short, theory provides a solid foundation for designing, implementing, and evaluating health promotion programs.