Requirements Definition with Extended Goal Graph

Significant requirements are often discovered during discussion about tradeoffs and conflicts between stakeholders in requirements meeting. Developing a method to handle tradeoffs and conflicts becomes a breakthrough to acquire significant requirements which are difficult to elicit for requirements analysts. In this paper, the Extended Goal Graph (EGG) is proposed as a method for handling tradeoffs and conflicts by providing traceability between requirements analysis and system design. We developed the EGG system to support requirement definition process with the EGG. The system was applied to the requirement definition meeting among medical doctors and potential patients for selecting proper inspections required for diagnosing disease when shadows on lungs were found.