Formal methods and testing are two important approaches that assist in the development of high quality software. While traditionally these approaches have been seen as rivals, in recent years a new consensus has developed in which they are seen as complementary. This article reviews the state of the art regarding ways in which the presence of a formal specification can be used to assist testing.

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Abstract.A new Reinforced Condition/Decision Coverage (RC/DC) criterion for software testing is proposed. This criterion provides further development of the well-known Modified Condition/Decision Coverage (MC/DC) criterion and is more suitable for testing of safety-critical software. Formal definitions in the Z notation for RC/DC, as well as MC/DC, are presented. Specific examples of using of these criteria are considered and some features are formally proved.

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