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UML Use Case Diagrams. Use case diagrams are usually referred to as behavior diagrams used to describe a set of actions (use cases) that some system or systems (subject) should or can perform in collaboration with one or more external users of the system (actors).
Many schematic diagrams use standard symbol sets. They may be representational and drawn to scale, such as in a floor plan, where they must convey precise measurements and placement of elements. Some schematics are more abstract, such as a circuit diagram, in which the drawing shows the layout of a system, but not how it will actually appear in the physical circuit.