Use Case Notation
In the Unified Modeling Language, the relationships between all (or a set of) the use cases and actors are represented in a Use Case Diagram or diagrams, originally based upon Ivar Jacobson's Objectory notation. SysML, a UML profile, uses the same notation at the system block level.
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“Thought is an infection. In the case of certain thoughts, it becomes an epidemic.”
—Wallace Stevens (1879–1955)