Impact of Non-functional Requirements on Requirements Evolution

Software impacts almost every aspect of modern society. Developers of a software system are responsible for identifying the requirements of the application, developing software that implements the requirements, and for allocating appropriate resources (processors and communication networks). Development of quality software systems has always been a great challenge for software developers. In practice, it happens that non-functional aspects are often ignored while focusing on the functionality of the system. Many systems have failed because of negligence of non-functional requirements. To study the impact of non-functional requirements on requirements evolution, this paper discusses various approaches, available in the literature, to represent non-functional requirements during software development. To study the impact of non-functional requirements on requirements evolution, this paper is focused on three issues: Different views on non-functional requirements, Representation of non-functional requirements and Dealing with non-functional requirements.