Must all products in the software product line share the same architecture? If my products have different architectures but make heavy use of other shared assets, isn that a software product line?
Only if that reuse is carried out in a “prescribed way,” as required by the definition of a software product line. In all the software product lines we have studied, that prescription is most effectively carried out by using a common architecture where individual products either share the same architecture or permitted variations of the same architecture an architecture we call the product line architecture. Variations might, for example, involve replacing one component with a similar one, instantiating a multiple component a different number of times, or exhibiting some subset of the overall architecture.
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