Integrating Semi - Formal and Formal Softwarespecification

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