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The programming language Alphard is designed to provide support for both the methodologies of "well-structured" programming and the techniques of formal program verification. Language constructs allow a programmer to isolate an abstraction, specifying its behavior publicly while localizing knowledge about its implementation. The verification of such an abstraction consists of showing that its implementation behaves in accordance with its public specifications; the abstraction can then be used with confidence in constructing other programs, and the verification of that use employs only the public specifications.
Wulf et al. (Wed,) studied this question.
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