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What is the difference between code reuse and software product line engineering?

Why is simple code reuse not successful enough?

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    Have you defined these terms? If so, share the definitions so we don't have to make any assumptions . – JeffO Feb 28 '17 at 16:23
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A simple google search turns up this definition:

The characteristic that distinguishes software product lines from previous efforts is predictive versus opportunistic software reuse. Rather than put general software components into a library in hopes that opportunities for reuse will arise, software product lines only call for software artifacts to be created when reuse is predicted in one or more products in a well defined product line.

Software Development Magazine - Project Management, Programming, Software Testing

Which is trying to say something like: intentionally designing a new ribbon control that can be used by all MS Office products is a little different than reusing the String class.

Seems like a line that would be easy to blur.

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