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Let's now start talking about UML, the Unified Modeling Language.

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And we are going to start by looking at UML

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structural diagrams. This are the diagrams that represent static characteristics

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of the system that we need to model. This is

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in contrast with dynamic models which instead behaviors of the

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system that we need to model. And we will also

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discuss dynamic models, later on in the lesson. We're going

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to discuss several kinds of diagrams, starting from the class

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diagram, which is a fundamental one in UML.

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The class diagram represents a static, structural view of

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the system, and it describes the classes and their

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structure, and the relationships among classes in the system.