ABSTRACTSetting up a system for maintaining control over an ongoing administrative process involves the problem of determining how frequently control information should be obtained. In this article a model for determining optimum reporting frequencies is described and explored from a managerial point of view emphasizing the data inputs and interpretations necessary to make the model operationally meaningful. Several forms of reporting schedules are discussed and procedures are given for determining optimum schedules under various operating conditions. An appendix contains a detailed statement of the mathematics and computations of a recursive procedure for determining an optimum schedule for a particular reporting situation and flow charts of the computer programs used for calculating optimum schedules for general use.