Abstract
In this paper, we report on the integration of informal, semiformal and formal system specification techniques. We present a framework for system specification called TRADE, within which several well-known semiformal specification techniques are placed. TRADE is based on an analysis of structured and object-oriented requirements specification methods. In this paper, we combine TRADE with the logic-based specification language Albert II and show that this leads to a coherent formal and semiformal requirements specification. We illustrate our approach with examples taken from a large distributed telecommunication application case study, performed in the context of the Esprit project 2RARE.
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