This paper describes a Petri net-based methodology that has been developed for the performance analysis of Real-Time Systems (RTS). A Flexible Manufacturing System (FMS), which is a case of a real-time system, has been used as a vehicle for our discussion. We use here Deterministic and Stochastic methods for modelling and analysing the performance of this Real-Time systems. Since the operational times of an FMS, such as machine times and part transfer times, are deterministic, we use

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... ic Timed Petri Nets (DTPNs) for obtaining the performance of the system modelled; whereas for analysing tool breakage and machine failure we use Generalised Stochastic Petri Nets, because such failures are random in nature. We use a software package developed inhouse for the deterministic timed analysis, whereas we use the GreatSPN1.3 for stochastic analysis.