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None of the answers so far seems to have picked up on the difference between conceptual and physical data modelling. A UML conceptual model will show inheritance relationships, cardinallity and all that good stuff, with the minimum of implementation detail. The physical model (ER diagram) will differ: Inheritance is no longer obvious. There are three ...


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Different modeling languages (Entity-Relation, Unified Modeling Language, and others) are simply notations for communicating a design to stakeholders. Communicating a design is technical communication, and one of the principles of good technical communication is to communicate the information clearly and concisely. Choosing a modeling notation that is ...


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When I am working on a new feature, I always use ERDs. To me, the data structures are more important than the classes that will be used to interact with them, and it is important to remember that the two are not necessarily identical. At some point in the future, it may become important for me to split a class into multiple classes, or to combine the object ...



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