Maintenance, or the 3rd dimension of eXtreme model-driven design

Service orientation leads to a completely new understanding and a much more end-user oriented tailoring of software design. We advocate a new software development paradigm: eXtreme Model-Driven Design (XMDD), designed to continuously involve the customer/application expert throughout the whole system's life cycle, including development and software maintenance. As maintenance is predominantly an adaption to new user requirements or to other global conditions, empowering the application expert would change the scene: Customer/application experts could rapidly adapt the system to their changing requirements. Source code becomes “only” a by-product and the development focuses on the model level. This paper presents a new development paradigm which realizes these ideas.