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Theory of Modules

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3 Author(s)
Gannon, J.D. ; Department of Computer Science and the Institute for Advanced Computer Studies, University of Maryland ; Hamlet, R.G. ; Mills, H.D.

Because large-scale software development is a struggle against internal program complexity, the modules into which programs are divided play a central role in software engineering. A module encapsulating a data type allows the programmer to ignore both the details of its operations, and of its value representations. It is a primary strength of program proving that as modules divide a program, making it easier to understand, so do they divide its proof. Each module can be verified in isolation, then its internal details ignored in a proof of its use. This paper describes proofs of module abstractions based on functional semantics, and contrasts this with the Alphard formalism based on Hoare logic.

Published in:

Software Engineering, IEEE Transactions on  (Volume:SE-13 ,  Issue: 7 )

Date of Publication:

July 1987

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