Abstract

A set of CASE tools is described for developing formal requirements specifications expressed in the SCR (Software Cost Reduction) tabular notation. The tools include an editor for building the specifications, a consistency checker for testing the specifications for consistency with a formal requirements model, a simulator for symbolically executing the specifications, and a verifier for checking that the specifications satisfy selected application properties. As background, the SCR method for specifying requirements is reviewed, and a formal requirements model is introduced. Examples are presented to illustrate the tools. 1 Introduction High assurance computer systems are computer systems where compelling evidence is required that the system delivers its services in a manner that satisfies certain critical properties. Examples of high assurance systems include military command and control systems, nuclear power plants, telephone networks, medical systems (e.g., patient monitoring sys...

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