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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).
Example of a flow diagram of a nuclear submarine propulsion system. Flow diagram is a collective term for a diagram representing a flow or set of dynamic relationships in a system. The term flow diagram is also used as synonym of the flowchart, and sometimes as counterpart of the flowchart.Flow diagrams are used to structure and order a complex system, or to reveal the underlying structure of the elements and their interaction.n theory and practice specific types of diagrams are also called a type of flow diagrams, such as: 1  Alluvial diagram, highlights and summarizes the significant structural changes in networks. 2  Circular flow of income. 3  Control flow diagram, a diagram to describe the control flow of a business process, process or program.