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A computer program has been developed for determining the interference occurring at various points in a complex network resulting from common impedance coupling of signals introduced at other points in the network. For a network of almost any complexity, the program can calculate the transfer function between any two points and thus determine the magnitude of the resulting signal. A simple network of ten parameters was first analyzed and the results were compared with laboratory measurements on a simulated network. Refinements were made to obtain good agreement. Skin effect was included to get agreement at frequencies as high as 10 Mc. A system of one hundred parameters was then analyzed. Curves of the computed and measured transfer functions are presented to show the agreement obtained. The results of this analysis are as accurate as the determination of the network parameters and the terminating impedances.