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These five modeling levels are presented in the following figure. Notice that the DBMS Model can be at either an Area Level scope, or a Project Level scope. It is not uncommon to have single ERD and KB models for a business and multiple DBMS Models, one for each implementation environment, and then another set within that environment for projects that do not share databases. In an ideal situation, there are a set of Area Level scope DBMS Models, one for each environment, with complete data sharing across all projects in that environment.
These models fall into two categories:
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