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Refinement and Reachability in Event_B

  • Jean-Raymond Abrial
  • Dominique Cansell
  • Dominique Méry
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3455)

Abstract

Since the early 90’s (after the seminal article of R. Back [4]), the refinement of stuttering steps [5] are performed by means of new actions (called here events) refining skip. It is shown in this article that such a refinement method is not always possible in the development of large systems. We shall instead use events refining some kind of non-deterministic actions maintaining the invariant (sometimes called keep). We show that such new refinements are completely safe. In a second part, we explain how such a mechanism can be used to express some reachability conditions that were otherwise expressed using some special temporal logic statements à la TLA [5] in a previous article [2]. Examples will be used to illustrate our proposals.

Keywords

Refinement Stuttering Reachability B Method 

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Jean-Raymond Abrial
    • 1
  • Dominique Cansell
    • 2
  • Dominique Méry
    • 3
  1. 1.ETHZ ZurichSwitzerland
  2. 2.LORIA, Université de MetzFrance
  3. 3.LORIA, Université Henri Poincaré Nancy 1France

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