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Seven computer simulation programs, developed to analyze a random access discrete address communications system, are discussed. Particular emphasis is placed upon four of the programs, which performed such functions as analysis of communications requirements, evaluation of mutual interference, evaluation of the adequacy of range extension equipment, and analysis of the overall system concept. The basic design of each program is discussed with attention to the situation modeled, the parametric input variations permitted, and the outputs provided. The development and use of these programs illustrates the significant contribution simulation can make in the analysis and design of large-scale communications systems.