The document discusses several key theories and thinkers in post-war city planning, beginning with three main conceptions: 1) town planning as physical planning, 2) design as central to town planning, and 3) the production of "master" or "blueprint" plans. It then profiles several influential planners and their ideas, including Clarence Perry and the neighborhood unit, Lewis Mumford and the organic city, Kevin Lynch and the elements of urban form, Jane Jacobs and bottom-up community planning, Clarence Stein and the expansion of the neighborhood concept, and Frank Lloyd Wright's Broadacre City decentralized plan.