Before we proceed to present major programming techniques appropriate to the developing of advanced simulators, it is justified to start from a brief overview of existing modeling and simulation terminology. We begin this chapter by introducing several concepts underlying models of discrete-event systems, especially those related to time management mechanisms and event sequencing procedures. We will then look at an example simulation model which can be easily executed by means of paper and pencil. The chapter concludes with the simplest simulation technique known as the activity-oriented approach. It will allow us to write simple yet non-trivial simulation programs.
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