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A new method is proposed that can identify a linear system with a random input signal in a short time for application to the identification of manual tracking systems whose response characteristics vary slowly with time. Making use of this method of identification, a display system including an on-line computer is constructed, which displays the slowly varying response characteristics of manual tracking systems on a CRT screen in real time. A software system that facilitates performance of various kinds of tracking experiments is developed. Finally, some results of simple pursuit tracking experiments are described and the mode of the tracking operation is discussed.