ABSTRACT
INTRODUCTION All our previous studies assumed that the element values are accurate and do not change. This may be an ideal situation but is not true in applications. Any system which is supposed to perform a certain function is built from components which always differ somewhat from the nominal value. The differences may not be large but if all components are not what they are supposed to be, it may happen that the system does not meet its specifications. It would certainly be nice to have an idea which components are critical and which are not. In electrical networks, this is achieved by the theory of sensitivities, the subject of this chapter.
