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.