ABSTRACT
This chapter deals with the problem of determining, rather than a single controller that meets the assigned specifications, a class of controllers that meet them. Using this technique, the class of the controllers can be expressed in function of one or more parameters that allow the designer to specify later additional control objectives. For this reason the problem to find a universal class of controllers which satisfy certain specifications takes the name of parameterization of the controllers. For simplicity, we mainly consider SISO systems, even if the discussed results may be easily generalized to MIMO systems as briefly shown in Section 13.5.
