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Analyzing evolution of variability in a software product line: from contexts and requirements to features

<09>This article analyses the changes occurred to the variability of product features by checking whether those changes to variation points are due to changes to the contexts, or changes to the stakeholder requirements. Analysing these reasons of changes to variation points has helped a Chinese Software company to gain focus on more valuable development activities for product customers over 3 years, directly contributed to the Design Self-Adaptive Software Systems NSFC project (2008~2010). The use of Problem Frames and i* requirements modelling tools has contributed to the EU FP7 SecureChange project (2009-2012) ""WP3 Evolving Requirements"" as an industrial case study.