This mathematical model of the educational system calculates information on population groups by sex, race, age, and educational level. The model can be used to answer questions about what would happen to the flows of students and teachers through the formal educational system if these flows are changed at various stages. The report discusses the major assumptions, methodology, and mathematical properties of the model, and the scope of its data. In addition to detailed calculations for 140 population groups from 1959 to 1970, the impact of selective changes in the model's parameters on the composition of the educational population is discussed. Appendixes contain tables and charts summarizing various aspects of the model, including the Dynamod II computer program. Related documents are EA 001 018; EA 001 062; EA 001 063; EA 001 064; EA 001 066; and EA 001 067. (Author/LLR)