UML Learning: Various relationships in use case diagrams (include, extend)

Various relationships in a use case diagram

I. Association between participants and use cases

The communication between the participant and the use case also becomes an association or a communication relationship.

Ii. relationship between use cases and use cases

Include relationship (include)

Extended relationship (Extend)

Include relationship

(1) Concept

Contains a relationship that describes a use case that requires a function that is defined by another use case, so that a defined use case can be invoked during the execution of the use case.

(2) Express symbol <<include>>

As in the previous article, the beverage vending machine Example: