The B-book: assigning programs to meanings
The B-book: assigning programs to meanings
Formal Methods in System Design - Special issue on The First Federated Logic Conference (FLOC'96), part II
Safety Critical Computer Systems
Safety Critical Computer Systems
Generalizing Action Systems to Hybrid Systems
FTRTFT '00 Proceedings of the 6th International Symposium on Formal Techniques in Real-Time and Fault-Tolerant Systems
Abstraction, Refinement And Proof For Probabilistic Systems (Monographs in Computer Science)
Abstraction, Refinement And Proof For Probabilistic Systems (Monographs in Computer Science)
Decomposition Structures for Event-B
IFM '09 Proceedings of the 7th International Conference on Integrated Formal Methods
Qualitative probabilistic modelling in event-B
IFM'07 Proceedings of the 6th international conference on Integrated formal methods
A stepwise development process for reasoning about the reliability of real-time systems
IFM'07 Proceedings of the 6th international conference on Integrated formal methods
Case study: Paris Metro Signaling System
IEEE Software
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Formal methods, in particular the B Method and its extension Event-B, have demonstrated their value in the development of complex control systems. However, while providing us with a powerful development platform, these frameworks poorly support quantitative assessment of dependability attributes. Yet, by assessing dependability at the early design phase we would facilitate development of systems that are not only correct-by-construction but also achieve the desired dependability level. In this paper we demonstrate how to integrate reliability assessment performed via Markov analysis into refinement in Event-B. Such an integration allows us to combine logical reasoning about functional correctness with probabilistic reasoning about reliability. Hence we obtain a method that enables building the systems that are not only provably correct but also have a required level of reliability.