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In Astah Professional you can convert Diagrams and Models within a Project, so that you can use the same model in many different diagrams to keep it's consistency. Convert between:
You can convert a Class Diagram to an ER Diagram, and vice versa.
Convert the Class Diagram to ER Diagram
Converted ER Diagram
Convert External Entity of DFD to Actor in a UseCase Diagram
Converted External Entity
Convert a lane in Flowchart to Actor in UseCase Diagram using the popup menu