We will also develop the concept of the sensitivity of a system to a parameter change, since it is desirable to minimize the effects of unwanted parameter variation. We then describe the transient performance of a feedback system and show how this performance can be readily improved.

We wish to reduce the effect of unwanted input signals, called disturbances, on the output signal.We will show how we may design a control system to reduce the impact of disturbance signals. Of course, the benefits of a control system come with an attendant cost. We will demonstrate how the cost of using feedback in a control system is associated with the selection of the feedback sensor device. The chapter concludes with a system performance analysis of the Sequential Design Example: Disk Drive Read System.

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