This issue of Partners in Social Change explores the ecological model of health behavior. As the word "ecological" implies, this structural model explores the relationship between human behavior and the environment. The beauty of the model lies in its assertion that our natural environment includes not only our corporeal surroundings, but also social and cultural forces, making the model particularly useful in program planning. It gives us a systematic approach to determine the appropriate level of intervention, the timing of intervention and the focus of the intervention. We'll focus on this model in two articles - one, an overview of the ecological framework and the other, a practical application of it. Also inside is a review of "The Macho Paradox," a book by Jackson Katz.