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Unified Modeling Language User Guide, The, Second Edition by Ivar Jacobson, James Rumbaugh, Grady Booch

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Chapter 32. Systems and Models

The UML is a graphical language for visualizing, specifying, constructing, and documenting the artifacts of a software-intensive system. You use the UML to model systems. A model is a simplification of reality—an abstraction of a system—created in order to better understand the system. A system, possibly decomposed into a collection of subsystems, is a set of elements organized to accomplish a purpose and described by a set of models, possibly from different viewpoints. Things like classes, interfaces, components, and nodes are important parts of a system's model. ...

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