Logical Models

There are three levels of logical models that are used to capture business information requirements:

• Entity Relationship diagram
• Key-Based model
• Fully-Attributed model

The Entity Relationship diagram and the Key-Based models are also known as area data models. They often cover a wide business area that is larger than the business chooses to address with a single automation project. In contrast, the Fully-Attributed model is a project data model. Typically it describes a portion of an overall data structure intended for support by a single automation effort.