Date: 22 May 2006

Designing a B model for safety-critical software systems

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The observations described in this paper are based on the experience we gained in applying the B method to a realistic safetycritical case study. The main goal was to integrate the B method into the heart of the development cycle, particularly for such applications. We outline a framework to reason about control process systems in order to capture functional and safety-related properties and to organize the conceptual architecture of these systems.

Thus, we describe how a B Model can be designed both with respect to safety constraints and in terms of software architecture abstractions. We use the B method to support architectural abstractions, codifying the interactions of components. Finally, we present essential results of the case study and we show the significant impact of such a B formal development on the development process by giving some metrics.