Definition from _(SEI) Engineering Practices (see below):
<blockquote>
A <em>software product line</em> is a set of software-intensive systems sharing a common, managed set of features that satisfy the specific needs of a particular market segment or mission and that are developed from a common set of core assets in a prescribed way.
</blockquote>

<ul class="links">
<li>_(SEI) _(Definition|http://www.sei.cmu.edu/plp/product_line_overview.html).
</ul>
