I am co-authoring a book dedicated to the high-level data model. We agree that this model has certain characteristics, such as: 1) it represents a broad business area; 2) this model is a level above a logical data model; 3) it contains less than 200 boxes, such as Customer, Product and Order; 4) the audience is usually the business user, not a technical audience; and 5) each box can represent dozens of entities on the logical and physical models. However, where we have a difference in opinion about what to call this high-level model.
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