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The Object Primer: Agile Model-Driven Development with UML 2.0

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  • Anonymous

    Posted July 26, 2005

    Timeless Principles

    I've been looking at the online text of Scott's Object Primer 3/e and just ordered my own copy, because he's the first person I've seen other than Ivar Jacobsen to get Use Cases completely right. I have been using Use Cases since before UML 1.0 and I have always been disappointed by the general inability of practitioners to understand and apply the extend and include dependencies (and their predecessors.) Many practitioners advise against the use of these dependencies (which is better than using them incorrectly or inconsistently.) I have found no tool that implements them completely and correctly. I was pleasantly surprised to find that Scott Ambler's treatment of these dependencies in the Object Primer 3/e matched my own experience applying them in many environments. First, he states they should be used sparingly. (Overly complex collections of use cases and diagrams are not helpful to anyone.) Second, he has a consistent notation for the point at which each extend or include dependency is invoked. (Some practitioners state that the base use case should not have a reference to the extension, others leave off references to included use cases - neither of these practices is consistent with UML 2.0.) These are simple principles, but not following them has caused many people to get far less out of their use cases than they could have.

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