Adding qualifiers to associations in UML diagrams

In UML models, you can add qualifiers to existing associations to index pairings between associated elements.

About this task

To add a qualifier to an association:

Procedure

Add an association relationship between two model elements, if the elements do not already have such a relationship.
In the Project Explorer view, expand the model element that you want to own the qualifier. The source model element contains an attribute that is named after the target model element; this attribute will own the qualifier. If the association relationship is bidirectional, either element can own the qualifier, but if the association relationship is directed, the source element must own the qualifier.
Right-click the attribute that is named after the target element and then click Add UML > Qualifier.

Results

The diagram shows a qualified association that conforms to UML 2.1 specifications.

What to do next

Note: Some UML elements do not own attributes; in such cases, the attributes that are named after the related elements are located in the Associations folder.