Use case diagram examples.
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What a use case diagram is.
A use case diagram is a UML behavioral diagram that shows what a system does from the perspective of its actors. Actors may be people, organizations, or external systems that interact with the system boundary.
Use cases name the outcomes the system provides. Include relationships show required reused behavior, while extend relationships show conditional or optional behavior.
- Standard
- OMG UML 2.5.1 §18
- Also follows
- Visual subset
- Engine
- schematex-usecase
- Editable
- Double-click text, drag nodes
- Export
- SVG · PNG · PDF
Who uses use case diagrams.
Clarify customer, administrator, payment, delivery, and inventory responsibilities before detailed requirements work.
Explain which people and services participate when a monitoring system detects a fall.
Define a registration chatbot’s student, advisor, database, and enrollment-system interactions.
How to make a use case diagram in three steps.
Describe it
One paragraph is enough to start.
See the drawing
Drawn by the right engine.
Say what changes
Every edit keeps a version.
Common questions
What is a use case diagram?
It is a UML diagram that shows actors and the functions they use within a system boundary.
What are the main components?
A use case diagram contains actors, use cases, associations, and a system boundary. It can also show include and extend relationships.
When should I use one?
Use one during requirements gathering or early design when stakeholders need a shared high-level view of system scope.
What is the difference between include and extend?
Include marks behavior that is always required by a use case. Extend marks behavior that occurs only under a stated condition.
Other drawings for the same work.
Define the system from the user’s view.
Free account, no card. Describe the actors, functions, and external systems.
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