If the people who write the code do not feel responsible for the model, or don’t understand how to make the model work for an application, then the model has nothing to do with the software. If developers don’t realize that changing code changes the model, then their refactoring will weaken the model rather than strengthen it. Meanwhile, when a modeler is separated from the implementation process, he or she never acquires, or quickly loses, a feel for the constraints of implementation. The basic constraint of MODEL-DRIVEN DESIGN—that the model supports an effective implementation and abstracts
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