The end of an association where it connects to a class is called an association role. Role names can be used instead of association names. A role name is a noun that denotes the purpose or capacity wherein one class associates with another. The role name is placed on the association near the class that it modifies, and may be placed on one or both ends of an association line. It is not necessary to have both a role name and an association name.
CREATING ROLE NAMES IN RATIONAL ROSE
Right-click on the relationship line near the class that it modifies to make the shortcut menu visible.
Select the Role Name menu choice.
Enter the ...