Use case diagram
Graphical depiction of system interactions
Use case diagram
A use case diagram is a graphical depiction of a user's possible interactions with a system. A use case diagram shows various use cases and different types of users the system has and will often be accompanied by other types of diagrams as well. The use cases are represented by either circles or ellipses. The actors are often shown as stick figures.
Read on Wikipedia · Image Kishorekumar 62 (redrawn by Marcel Douwe Dekker), CC BY-SA 3.0
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