Software Product Line Testing -- A 3D Regression Testing Problem

In software product line engineering, testing for regression concerns not only versions, as in one-off product development, but also regression across variants. We propose a 3D process model, with the dimensions of level, version and variant, to help analyze, plan and manage software product line testing. We derive the model from empirical observations of regression testing practice and software product line testing theory and practice, and look forward to see the model evaluated in practitioner-oriented research.