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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“In the case of all other sciences, arts, skills, and crafts, everyone is convinced that a complex and laborious programme of learning and practice is necessary for competence. Yet when it comes to philosophy, there seems to be a currently prevailing prejudice to the effect that, although not everyone who has eyes and fingers, and is given leather and last, is at once in a position to make shoes, everyone nevertheless immediately understands how to philosophize.”
—Georg Wilhelm Friedrich Hegel (1770–1831)