Modeling Nonfunctional Requirements in Software Product Line

Several approaches of modeling nonfunctional requirements (NFRs) of single product have emerged and little attention has been paid to model NFRs of software product line (SPL). This paper first argues the necessity and challenges of modeling and managing NFRs in SPL, and then presents an approach built on an existing SPL requirements modeling approach–feature modeling, to explicitly model NFRs-related assets in feature model. The approach is designed to be extensible to model NFRs of different types, and to effectively manage complexity of feature model with NFRs.