A workshop/conference held in Boulder, Colorado, during two weeks of summer 1972 had the goal of bringing together a group of university researchers and planning practitioners to "think through" how the research requirements of environmental/land-use planning might be met and to identify the areas of new knowledge needed by practitioners and society at large if they are to do a better job of planning the physical environment. The conference encompassed two elements: (1) the substantive questions dealing directly with the problems involved in planning physical environments (within a broad societal framework) and (2) research organization--what needs to be done to insure that the necessary research is carried out. The book is divided into four parts. Part 1 presents the recommendations of high-priority research for land-use planning and allocation that were developed by the workshop participants. Part 2 contains an introductory chapter and an historical overview of land-use planning in the United States. Part 3 comprises a collection of nine background papers devoted to various topics concerning the social, economic, and natural environmental factors important to environmental/land-use planning. Part 4 contains six committee reports that were prepared during the conference. (Author/MLF)