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The immediate attention of the control systems engineer is directed to the dynamic behavior of the system under study. It is important to study the effects on overall system performance by varying one or more parameters (mass, inertia, gain, resistance, etc.). It is equally important to determine whether a desired dynamic behavior can be achieved with any set of values for the parameters--if not, redesign is indicated. A control systems analysis package is developed using parameter plane methods. It is an interactive, user-friendly comptuter aid. Given a characteristic equation containing two variable parameters, the output of the analysis may be either tabular or graphical, with plots of any of the following types: 1) Constant damping curves as a function of frequency, 2) Constant frequency curves as a function of damping, 3) Constant sigma lines (real root lines), 4) Constant zeta-omega (damping-frequency) curves.