Expressing product diversification - Categorizing and classifying variability in software product family engineering

In a software product family context, software architects design architectures that support product diversification in both space (multiple contexts) and time (changing contexts). Product diversification is based on the concept of variability: a single architecture and a set of components support a family of products. Software product families have to support increasing amounts of variability, thereby making variability engineering a primary concern in software product family development. The first part of this paper (1) suggests a two-dimensional, orthogonal categorization of variability realization techniques and classifies these variability categories into system maturity levels. The second part (2) discusses a case study of an industrial software product family of mobile communication infrastructure for professional markets such as the military. The study categorizes and classifies the variability in this product family according to criteria common to virtually all software development projects.