| 1: | Suppose a company builds two similar systems using a large set of common assets, including an architecture. Clearly these two systems form a product line. If they shared only an architecture but no elements, would they still be a product line? Suppose they shared only a single element. Suppose that all they shared was the same operating system and programming language runtime libraries. Suppose that the shared asset was the team of developers. Would they be a product line then?
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