Described is a mathematical model developed to analyze and project nursing requirements and resources in New York State one to five years into the future. The model was developed as part of a manpower planning project at the Western Interstate Commission for Higher Education. New York was one of six states that tested the model. Because it incorporates all major elements of manpower supply and demand the model should be of particular interest to health systems agencies, units of state government responsible for health care, and providers of health care. Its requirements for professional judgment create many opportunities for much needed communication on a variety of important topics. Although designed specifically to study nursing manpower, it appears to have significant potential for the study of manpower in other health professions. (Author/MSE)