...quality
We have rejected the word ``quality" because there are some non-functional characteristics of software which are not related with the quality itself; for instance, the kind of user interface of a system, or the programming language used to write the code.
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...components
Obviously, there can be a few changes to fit the notation into a particular pair of languages, most of them syntactic in nature [Fra97]
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Xavier Franch
Sept. 2, 1997