MDA Explained The Model Driven Architecture¿: Practice and Promise

bull; Concrete guidance to IT professionals facing the recurring problem of delivering this year's project on-time and on-budget bull; Allows developers to create robust, machine-readable models that can be stored and repeatedly accessed bull; The authors have contributed to the creation of MDA, worked on commercial products that implement it, and used it in practice

Anneke Kleppe is a consultant and adviser at Klasse Objecten, which she founded in 1995 to train and coach companies on the use of object technology, modeling, and MDA. She was intensively involved in the development of the Unified Modeling Language (UML) and the new UML 2.0 standard. The author of several books, Anneke started a knowledge center for object technology at KPN Research in Leidschendam, Netherlands. She is a member of the authoring team of the OCL 2 standard, where she has a special focus on the definition of the semantics of the OCL.

Jos Warmer is the primary author of the OCL standard. He is an active member of the Unified Modeling Language (UML) Revision Task Force, which defined the revisions in the UML 2.0 standard. Previously he was a member of the UML core team, where he was responsible for the development of the Object Constraint Language (OCL). The author of several books and numerous international articles, Jos is an advisor on the UML method and techniques at the De Nederlandsche Bank.

Wim Bast is Compuware’s OptimalJ MDA architect.

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For many years, the three of us have been developing software using object-oriented techniques. We started with object-oriented programming languages like C++, Small-talk, and Eiffel. Soon we felt the need to describe our software at a higher level of abstraction. Even before the first object-oriented analysis and design methods like Coad/Yourdon and Object Modeling Technique (OMT) were published, we used our own invented bubble and arrow diagrams. This naturally led to questions like, "What does this arrow mean?" and "What is the difference between this circle and that rectangle?" We therefore rapidly decided to use the newly emerging methods to design and describe our software. Over the years we found that we were spending more time on designing our models than on writing code. The models helped us to cope with larger and more complex systems. Having a good model of the software available made the process of writing code easier, and in many cases, even straightforward. In 1997 some of us got involved in defining the first standard for object-oriented modeling called Unified Modeling Language (UML). This was a major milestone that stimulated the use of modeling in the software industry. When the OMG launched its initiative on Model Driven Architecture (MDA), we felt that this was logically the next step to take. People try to get more and more value from their high-level models, and the MDA approach supports these efforts. At that moment we realized that all these years we had been naturally walking the path toward model-driven development. Every bit of wisdom we acquired during our struggle with the systems we had to build fitted in with this new idea of how to build software. It caused a feeling similar to an AHA-experience: "Yes, this is it!"the same feeling we had years before when we first encountered the object-oriented way of thinking, and again when we first read the GOF book on design patterns. We feel that MDA could very well be the next major step forward in the way software is being developed. MDA brings the focus of software development to a higher level of abstraction, thereby raising the level of maturity of the IT industry. We are aware of the fact that the grand vision of MDA, which Richard Soley, the president of the OMG, presents so eloquently, is not yet a reality. However, some parts of MDA can already be used today, while others are under development. With this book we want to give you insight into what MDA means and what you can achieve, both today and in the future. Anneke Kleppe Jos Warmer Wim Bast Soest, the Netherlands, March 2003 032119442XP04072003