The process of modelling and developing commonality and variability for system families should be supported by suitable methods and notations. The object-oriented methods and their notations, which are used at present, focus on the development of a single system at a time. This paper analyses feature models as a representation of the common parts and variants contained in a system family, and proposes using a feature diagram as a basic representation of commonality, variability and dependencies. The paper examines various approaches to customizing the standard modelling language UML to model system families and proposes how to extend the UML for the purposes of modelling variants in object-oriented analysis and design techniques.
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