INTRODUCTION In general, simulation has two main uses. One is to provide a basis for predicting how the system simulated will perform under varied conditions and for determining which conditions are necessary for optimum performance. The other is more basic. Complex systems can be beyond the scope of human comprehension, and the statistical data generated in a simulation can be used to further the understanding of the interworkings of the system under study. The knowledge gained can, in turn,

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... come the basis for further analysis and evaluation. Results can improve the performance of the system being simulated, as well as broaden performance goals and· attainments of future systems; This paper describes the design and use of a simple time-sHaring, multi-programming model. Both goals of the simulation study were met: 1. To estimate the requirements for optimum performance. 2. To 'obtain a basic understanding, through use of a simple model, of what happens in a multi-programming environment.