In UML models, you can set the multiplicity value, or
range of values, on both ends of an association between classifiers to
show the number of objects that can participate in the relationship.
You can also set the multiplicity of an attribute to specify the
number of values that you can associate with that attribute.
To set the multiplicity property:
- In the diagram editor, click an association or
an attribute.
- In the Properties view, click the General tab.
- On the General page, complete one
of the following steps:
- For an association, in the multiplicity field for
each end of the association, type a value.
- For an attribute, in the multiplicity field, type a multiplicity
value or range of values.