When high reiability requirements are set in the specificantion of complex, large and high investment demanding systems, the reliability demonstration, which the customer acceptance will be based on, can be a very critical task as the cumulative testing time available for the on-the-field reliablity assessment is often not sufficient to ensure acceptable consumer and producer risks. In these circumstances, suitable reailability models, to be implemented and s olved by means of appropiate software tools, are to be used in order to predict and assess the s7ystem reliability performances. In this paper the authors present a modelling procedure, based on Monte carlo method, for simulating a long-term reliability test and able to fulfil the above requirements. The core of the simulation is a representation of the system behavirour, in the presence of failures, in the state-space where transitions are driven by the events generated by the Monte Carlo reliability model of the basic components.
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