The dream was that software developers could leave behind the details of textual code and author systems in a higher-level language of diagrams. Indeed, so the dream goes, we might not need programmers at all. Architects could create whole systems from UML diagrams. Engines, vast and cool and unsympathetic to the plight of mere programmers, would transform those diagrams into executable code. Such was the grand dream of Model Driven Architecture (MDA). Unfortunately, this grand dream has one tiny little flaw. MDA assumes that the problem is code. But code is not the problem. It has never been
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