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A main concern in the initial phases of the development of a system t o be built is capturing the system requirements and expressing them as an adequate model, either formal or informal. In subsequent phases of the development of the system this model is used as reference for transformation steps. In this paper we describe a reasonably successful experimental strategy for the implementation of real-time systems, starting from a formal Specification, resulting in an Ada 95 implementation ofthe system and we evaluate the approach based upon practical experiences.

This paper reports our experiences with using an extension of timed automata [1] for schedulability analysis of prototype implementations. The approach builds upon requirements specifications constructed using the formal real-time specification language Astral [7]. Astral specifications are translated into extended timed automata. The resulting automata are augmented with implementation details like assignment of processes to processors, priorities, worst-case execution times of operations, and scheduling policies. Schedulability analysis is then performed by (automated) formal verification of the extended automaton.

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