Relationships

Associations

Associations connect actors to use cases, representing that the actor participates in the use case.

Include Relationship

An include relationship indicates that a use case always includes the behavior of another use case. Use .> to represent includes:

Extend Relationship

An extend relationship indicates that a use case optionally extends the behavior of another use case. Use <|-- to represent extends:

Generalization

Generalization represents an "is-a" relationship between use cases or actors. Use --|> or <|-- for generalization:

Arrow Styles

You can customize arrow styles with different line types:

• --> Solid arrow (default)
• ..> Dotted arrow
• -- Solid line (no arrow)
• .. Dotted line (no arrow)

Relationship Labels

Add labels to relationships to describe their purpose: