In recent years, a formidable gulf has opened up between planning theory and practice. Over the past four decades, planning academics have developed strong theories and created models to accompany and elucidate the planning process. However, many planning practitioners have resisted the notion that theory can play a positive role in the solution of concrete planning problems This volume provides a comprehensive overview of all the main planning theories and models, while also introducing an innovative new model and a set of tools. Modeled on the theories of Mario Bunge this dynamic new approach allows planners to achieve a better understanding of the complexities involved in the role of planners and their impact on the built environment.