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A new procedure for a design of multi-range controllers for use with highly nonlinear systems is developed.The procedure involves obtaining the describing function models of the nonlinear plant by software followed by designing a controller at nominal conditions.Then,the controller parameters are optimized to yield a satisfactory closed-loop response at all operating regimes.Finally,the performance and stability of the closed-loop system comprised of the designed controller and the nonlinear plant are verified.The procedure and the associated software are applied to a nonlinear control problem of the sort encountered in aerospace,and the results are compared with two other approaches.