A range of current approaches to architecture are neglected in our contemporary writings on design philosophies. This book argues that the model of 'function' and the concept of a 'functional building' that we have inherited from the twentieth-century Modernists is limited in scope and detracts from a full understanding of the purposes served by the built environment. It simply does not cover the range of functions that buildings can afford nor is it tied in a conceptually clear manner to our contemporary concepts of architectural theory. Based on Abraham Maslow's theory of human motivations, and following on from Lang's widely-used text, Creating Architectural Theory: The Role of the Behavioral Sciences in Environmental Design, Lang and Moleski here propose a new model of functionalism that responds to numerous observations on the inadequacy of current ways of thinking about functionalism in architecture and urban design. Copiously illustrated, the book puts forward this model and then goes on to discuss in detail each function of buildings and urban environments.