The Ph.D. program in Environmental Design and Planning in the College of Architecture and Urban Studies attracts students with widely differing backgrounds and interests. In order to accommodate this diversity, curriculum requirements are defined in five streams. The streams are: * Planning * Public and International Affairs * Architecture * Design * Construction and Building Science On entry into the program, students typically follow the requirements associated with one or the other of the five streams. For those wishing to pursue research interest that crosses streams the program committee may propose a combined set of requirements in writing for approval.