Escort: an environment for specifying communication requirements

A prototype specification support system, Escort, is described that incorporates novel validation, verification, and simplification methods for telecommunications software specifications. Unix was adapted as the operating system for Escort, and many of Escort's tools were designed and implemented by making full use of the Unix facilities. Escort identifies three kinds of specification errors: errors in the grammar of the specification language, called syntax errors; those that degrade consistency and completeness, called logical errors; and those that degrade correctness, called semantic errors. It detects these errors using syntax analysis, validation, and verification, respectively.<
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