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Erschienen in:
2014 | OriginalPaper | Buchkapitel
Variations on Safety
verfasst von : Orna Kupferman
Erschienen in: Tools and Algorithms for the Construction and Analysis of Systems
Verlag: Springer Berlin Heidelberg
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Of special interest in formal verification are
safety
properties, which assert that the system always stays within some allowed region, in which nothing “bad” happens. Equivalently, a property is a safety property if every violation of it occurs after a finite execution of the system. Thus, a computation violates the property if it has a “bad prefix”, all whose extensions violate the property. The theoretical properties of safety properties as well as their practical advantages with respect to general properties have been widely studied. The paper surveys several extensions and variations of safety. We start with
bounded
and
checkable
properties – fragments of safety properties that enable an even simpler reasoning. We proceed to a
reactive
setting, where safety properties require the system to stay in a region of states that is both allowed and from which the environment cannot force it out. Finally, we describe a probability-based approach for defining different levels of safety.