Although multiplicity is specified for classes, it defines the number of objects that participate in a relationship. Multiplicity defines the number of objects that are linked to one another. There are two multiplicity indicators for each association or aggregation—one at each end of the line. Some common multiplicity indicators are
|0..*||Zero or more|
|1..*||One or more|
|0..1||Zero or one|
|5..8||Specific range (5, 6, 7, or 8)|
|4..7,9||Combination (4, 5, 6, 7, or 9)|
CREATING MULTIPLICITY IN RATIONAL ROSE
Double-click on the relationship line to make the Specification visible.
Select the Detail tab for the role ...