A Key-Based (KB) Model is a data model that fully describes all of the major data structures that support a wide business area. The goal of a KB model is to include all entities and attributes that are of interest to the business.
As its name suggests, a KB model also includes keys. In a logical model, a key identifies unique instances within an entity. When implemented in a physical model, a key provides easy access to the underlying data.
Basically, the key-based model covers the same scope as the Entity Relationship Diagram (ERD) but exposes more of the detail, including the context where detailed implementation level models can be constructed.
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