title: Specifying Modal Systems using Event-B creator: Dotti, Fernando creator: Iliasov, Alexei creator: Romanovsky, Alexander subject: Composition and reuse subject: Methodology subject: Event-B description: Several safety-critical systems, such as avionic, transportation and space systems, use the notion of operation modes. Operation modes are useful structuring units that facilitate design, specially if used with state-based formal methods. However, modelling abstractions to support the specification, analysis and correct construction of modal systems are still lacking. The contribution of this paper is twofold: (i) modal systems and modal systems refinement are discussed and formalized; (ii) the relation of a modal system specification with an Event-B model is discussed, showing how to demonstrate that the behaviour of an Event-B model can satisfy a modal system. publisher: (Technical report) type: Other type: NonPeerReviewed format: application/pdf identifier: http://deploy-eprints.ecs.soton.ac.uk/134/1/modesFM.pdf identifier: Dotti, Fernando and Iliasov, Alexei and Romanovsky, Alexander Specifying Modal Systems using Event-B. (Technical report). (Unpublished) relation: http://deploy-eprints.ecs.soton.ac.uk/134/