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The high cost of modern remote communications systems dictates optimum utilization of such facilities. Design and performance evaluation of these systems must not be left to intuitive or heuristic reasoning; instead, formal procedures, both analytic and empirical, must be developed to provide well-utilized, high-performance systems. To this end a large number of techniques1,2 have been developed and emplopyed in the recent past. Among these are hardware and software monitoring, simulation, analytical modeling, and decision-theoretic approaches.