IN this chapter we discuss the aim of and the approach normall evaluation of computer and communication
systems in Section 1.1. A classification
solution techniques is presented in Section 1.2. The fact that we will need stochastic models is motivated in Section 1.3. As a special case of these, we then introduce queueing models in Section 1.4. Finally, in Section 1.5, we discuss the use of software tools for model construction and solution.