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Structured ER Diagrams

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Normally, there is no specific order of presentation of the entities in an ER diagram. Each entity can be placed anywhere in the diagram.

The KeepTool ER Diagrammer produces Structured E/R Diagrams (SER):

All independent entities are placed on the left-hand side of the diagram.

Each dependent entity is placed to the right of its parent entity (except in the case of circular dependencies).

That means that you can read Structured Entity/Relationship diagrams from left to right. In any given situation, you will find

Master entities on the left and

Subordinate entities on the right.