Supporting variability in goal-based requirements

This paper addresses the problem of introducing variability in goal-based requirements. The proposed approach adopts and extends the KAOS goal oriented metamodel with variability concepts. The resulting metamodel is then used to model common and variable requirements at goal level. The application domain is the Cycab, a public vehicle with fully automated driving capability. A software prototype is also presented. It helps validate the work with a partial version of the Cycab. This work is achieved as part of the TACOS* project whose aims is to define a component-based approach to specify trustworthy systems from the requirements phase to the specification phase.