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<p>Requirements are the initial and basic building blocks combining processes in a product's life-cycle. The article describes a field study with data from 246 industry projects in the domains of software platforms, embedded systems and software applications. The study reveals that four life-cycle techniques must be used simultaneously to achieve tangible performance improvement measured by schedule adherence. Each technique is discussed using concrete, practical experiences.</p><p>This article is part of a special issue on requirements engineering.</p>
PLM, portfolio management, product management, project management, product life cycle, process improvement, requirements engineering

C. Ebert, "Understanding the Product Life Cycle: Four Key Requirements Engineering Techniques," in IEEE Software, vol. 23, no. , pp. 19-25, 2006.
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