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Chapter 32. Systems and Models
In this chapter
- Systems, subsystems, models, and views
- Modeling the architecture of a system
- Modeling systems of systems
- Organizing the artifacts of development
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 realityan abstraction of a systemcreated 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. In the UML, you use models to organize these and all the other abstractions of a system. As you move to more-complex domains, you'll find that a system at one level of abstraction looks like a subsystem at another, higher, level. In the UML, you can model systems and subsystems as a whole so that you can seamlessly move up to problems of scale.Well-structured models help you visualize, specify, construct, and document a complex system from different, yet interrelated, aspects. Well-structured systems are functionally, logically, and physically cohesive, formed of loosely coupled subsystems.
