It is typically features that vary in a software product line. This paper reaches further with the aim of understanding the quality attribute variability, performance in this case. The paper is a result from the close collaboration of ESE research group at the University of Helsinki with Aalto University and the case company Nokia.
Myllärniemi, V, Savolainen, J, Raatikainen M and Männistö T, 2015. Performance variability in software product lines: proposing theories from a case study. Empirical Software Engineering (published online: .
http://link.springer.com/article/10.1007%2Fs10664-014-9359-z