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The place of simulation in system design is developed in relation to all other steps in the design process. From this, the relation of simulation to both the analytical attack, on the one hand, and to a final operational system, on the other, is developed. This leads naturally to the program to be followed in a simulation setup. In this discussion the pitfalls to be avoided are emphasized. Then simulation of a human link in a system is discussed. Finally, a critique of simulation is given with relation to cost, time, difficulty of execution, treatment of nonlinearities, and noisy inputs.