The preliminary purpose of this research on educational planning was to develop the methodology for the construction and to determine the feasibility of a computerized mathematical model that would project college and university enrollments in New York State. It was recommended that a simulation model be constructed as a prototype for a comprehensive state-wide model. The major thrust of this study was towards the development of such a model, to provide insights into its operating characteristics, and to evaluate its relationship to an information system for higher education in New York State. Section I describes the structure of the prototype simulation model --developed in the form of a working computer program-- from the standpoint of both the mathematics and the computer programing involved. Case studies were conducted at the City University of New York, Rensselaer Polytechnic Institute, and the Hudson Valley Community College in order to implement the model in 3 different yet collectively representative educational systems. Section II details the data requirements of the prototype model so that data collection problems discussed in the 3 case studies may be put into proper perspective. Section III reports on the case studies, which were designed to assess the facility of --and to reveal potential problem areas in -- the implementation of a full-scale model. Based on the results of the case studies, Section IV presents a set of conclusions and recommendations for additional work toward full-scale implementation of the model. (WM)