This connection can break down in many ways, but the detachment is often a conscious choice. Many design methodologies advocate an analysis model, quite distinct from the design and usually developed by different people. It is called an analysis model because it is the product of analyzing the business domain to organize its concepts without any consideration of the part it will play in a software system. An analysis model is meant as a tool for understanding only; mixing in implementation concerns is thought to muddy the waters. Later, a design is created that may have only a loose
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