Quantitative Non Functional Requirements evaluation using softgoal weight

The goal oriented requirements analysis approaches have been introduced to compare non-functional requirements (NFR), such as safety and security. Several approaches to manage goal attributes have also been proposed to evaluate NFR goals quantitatively. In this paper, the quantitative weighted softgoal is proposed based on the Softgoal Interdependency Graphs (SIG) that helps engineers evaluate non-functional requirements. The evaluation results of the weighted SIG applications are shown to develop non-functional requirements and choose alternative design decisions. Additionally, the industrial case study of the weighted softgoal is shown to select the appropriate architecture decision in an automotive software development domain.