Mathematical model building for educational planning in this country has been heavily influenced by the USOE DYNAMOD Model, a computerized Markov-type or input-output model. However, the input-output method is structurally inadequate to reflect the true behavior of the educational system. To introduce some elements of decision making into the model, some investigators have attempted to apply optimal control theory. Application of optimal control theory involves the addition of control variables, which are constrained in their values and thus reflect political or policy limits, to a general mathematical model consisting of equations defining the interdependence of sets of variables characterizing the educational system. Control theory models are theoretically attractive planning devices because they allow for the specification of a system's initial states and certain desired targets while providing for the selection of a policy which achieves these targets at a minimum cost while satisfying existing constraints. Although barriers to practical implementation exist, this approach promises to aid in revealing the values of a systems approach to social and economic problems. (TT)