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Software writing is difficult for many reasons. One important reason is the interplay between the formal world of the computer and its programming language with the informal world where the problem to be solved is located. In this paper some of the direct and indirect consequences of this interplay are briefly discussed, both for software specification and design generally and for the composition...
A requirement is a desired relationship among phenomena of the environment of a system, to be brought about by the hardware/software machine that will be constructed and installed in the environment. A specification describes machine behaviour sufficient to achieve the requirement. A specification is a restricted kind of requirement: all the environment phenomena mentioned in a specification are shared...
As software developers we are engineers because we make useful machines. We are concerned both with the world, in which the machine serves a useful purpose, and with the machine itself. The competing demands and attractions of these two concerns must be appropriately balanced. Failure to balance them harms our work. Certainly it must take some of the blame for the gulf between researchers and practitioners...
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