THEORY AT A GLANCE Why Is Theory Important to Health Promotion and Health Behavior Practice? Effective public health, health promotion, and chronic disease management programs help people maintain and improve health, reduce disease risks, and manage chronic illness. They can improve the well-being and self-sufficiency of individuals, families, organizations, and communities. Usually, such successes require behavior change at many levels, (e.g., individual, organizational, and community). Not all health programs and initiatives are equally successful, however. Those most likely to achieve desired outcomes are based on a clear understanding of targeted health behaviors, and the environmental context in which they occur. Practitioners use strategic planning models to develop and manage these programs, and continually improve them through meaningful evaluation. Health behavior theory can play a critical role throughout the program planning process. What Is Theory? A theory presents a systematic way of understanding events or situations. It is a set of concepts, definitions, and propositions that explain or predict these events or situations by illustrating the relationships between variables. Theories must be applicable to a broad variety of situations. They are, by nature, abstract, and don't have a specified content or topic area. Like empty coffee cups, theories have shapes and boundaries, but nothing inside. They become useful when filled with practical topics, goals, and problems. • Concepts are the building blocks-the primary elements of a theory. •Constructs are concepts developed or adopted for use in a particular theory. The key concepts of a given theory are its constructs. • Variables are the operational forms of constructs. They define the way a construct is to be measured in a specific situation. Match variables to constructs when identifying what needs to be assessed during evaluation of a theory- driven program. Models may draw on a number of theories to help understand a particular problem in a certain setting or context. They are not always as specified as theory. Most health behavior and health promotion theories were adapted from the social and behavioral sciences, but applying them to health issues often requires that one be familiar with epidemiology and the biological sciences. Health behavior and health promotion theories draw upon various disciplines, such as psychology, sociology, anthropology, consumer behavior, and marketing. Many are not highly developed or have not been rigorously tested. Because of this, they often are called conceptual frameworks or theoretical frameworks; here the terms are used interchangeably. How Can Theory Help Plan Effective Programs? Theory gives planners tools for moving beyond intuition to design and evaluate health behavior and health promotion interventions based on understanding of behavior. It helps them to step back and consider the larger picture. Like an artist, a program planner who grounds health FOUNDATIONS OF APPLYING THEORY IN HEALTH PROMOTION PRACTICE interventions in theory creates innovative ways to address specific circumstances. He or she does not depend on a "paint-by- numbers" approach, re-hashing stale ideas, but uses a palette of behavior theories, skillfully applying them to develop unique, tailored solutions to problems. Using theory as a foundation for program planning and development is consistent with the current emphasis on using evidence- based interventions in public health, behavioral medicine, and medicine. Theory provides a road map for studying problems, developing appropriate interventions, and evaluating their successes. It can inform the planner's thinking during all of these stages, offering insights that translate into stronger programs. Theory can also help to explain the dynamics of health behaviors, including processes for changing them, and the influences of the many forces that affect health behaviors, including social and physical environments. Theory can also help planners identify the most suitable target audiences, methods for fostering change, and outcomes for evaluation. Researchers and practitioners use theory to investigate answers to the questions of "why," "what," and "how" health problems should be addressed. By seeking answers to these questions, they clarify the nature of targeted health behaviors. That is, theory guides the search for reasons why people do.or do not engage in certain health behaviors; it helps pinpoint what planners need to know before they develop public health programs; and it suggests how to devise program strategies that reach target audiences and have an impact. Theory also helps to identify which indicators should be monitored and measured during program evaluation. For these reasons, program planning, implementation, and monitoring processes based in theory are more likely to succeed than those developed without the benefit of a theoretical perspective. Explanatory Theory and Change Theory Explanatory theory describes the reasons why a problem exists. It guides the search for factors that contribute to a problem (e.g., a lack of knowledge, self-efficacy, social support, or resources), and can be changed. Examples 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. It spells out concepts that can be translated into program messages and strategies, and offers a basis for program evaluation. Change theory helps program planners to be explicit about their assumptions for why a program will work. Examples of change theories include Community Organization and Diffusion of Innovations. Figure 1. illustrates how explanatory theory and change theory can be used to plan and evaluate programs. Fitting Theory to the Field of Practice This monograph includes descriptions and applications of some theories that are central to health behavior and health promotion practice today. No single theory dominates health education and promotion, nor should it; the problems, behaviors, populations, cultures, and contexts of public health practice are broad and varied. Some theories focus on individuals as the unit of change. Others examine change within families, institutions, communities, or cultures. Adequately addressing an issue may require more than one theory, and no one theory is suitable for all cases.

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