Nonfunctional requirements as a driving force of software development
Patricia Rodriguez-Dapena, Tullio Vardanega, Jos J. M. Trienekens, Aarnout Brombacher, Julio Gutiérrez-Rı́os · Software Quality Professional Magazine · 2001
Nonfunctional software requirements, such as safety, reliability, reusability, and portability, are becoming both the focus of consumers and the market drivers of producers. Frequently, they are too vaguely expressed or exceedingly difficult to eng..