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A six-valued logic to reason about uncertainty and inconsistency in requirements specifications

Abstract:

The development of requirements specifications is characterized by the uncertain and changeable knowledge available about the systems to be built. This paper presents a many-valued logic that enables effective reasoning about uncertainty and inconsistency in requirements specifications, motivating the election of six truth values and the definition of a new implication connective. The adequacy of this logic to support a formal development methodology is assessed through a comparison with Belnap's four-valued logic in combination with the classical implications.