5.3 Structural models
Structural models of software display the organization of a system in terms of the components that make up that system and their relationships. Structural models may be static models, which show the organization of the system design, or dynamic models, which show the organization of the system when it is executing. These are not the same things—the dynamic organization of a system as a set of interacting threads may be very different from a static model of the system components.
You create structural models of a system when you are discussing and designing the system architecture. These can be models of the overall system architecture or more detailed models of the objects in the system and their relationships.
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