ERDs or Entity-Relationship Diagrams are a pictorial display of the tables (entities) within the data base structure.

The modules in the application are comprised of many different tables, such as the ‘Identity’ or ‘Assignment’. The tables within the system interact with one another and share information. Through these associations, ‘relationships’ form and tables can become dependant on others. The Entity Relationship Diagrams (ERDs) in this manual will explain the interaction that tables in the application have with one another.

Within an ERD, a table is represented as a box containing information about the table.

Most boxes found in the ERD’s however, provide the user with detailed information about the table.