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Behavioral UML diagrams. A use case diagram at its simplest is a representation of a user's interaction with the system that shows the relationship between the user and the different use cases in which the user is involved.
Tips for Effective ER Diagrams. 1  Make sure that each entity only appears once per diagram. 2  Name every entity, relationship, and attribute on your diagram. 3  Examine relationships between entities closely. 4  Use colors to highlight important portions of your diagram.