12 CrossTalk—January/February 2014 LEGACY SYSTEM SOFTWARE SUSTAINMENT Paul Clements, BigLever Software, Susan P. Gregg, Lockheed Martin, Charles Krueger, BigLever Software, Jeremy Lanman, U.S. Army PEO STRI, Jorge Rivera, General Dynamics, Rick Scharadin, Lockheed Martin, James T. Shepherd, Lockheed Martin, Andrew J. Winkler, Lockheed Martin Abstract. Product Line Engineering (PLE) is a well-established engineering disci- pline that pr

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