In a static structure diagram, a binary association is a relationship between exactly two classes. You can add name and stereotype properties to a binary association. The point where a binary association connects to a class is called an association end or role. Properties related to a specific role, such as end name, multiplicity, aggregation, and navigability are attached to an association end.
Name a Binary Association shape and add adornments to its ends
Open the element's UML Properties dialog box by double-clicking the icon that represents the element in the tree view or the shape that represents the element in a diagram.
Control which property values display on a shape in a diagram by right-clicking the shape, and then clicking Shape Display Options. In the UML Shape Display Options dialog box, select and clear options to display or hide property values.
Control which property values are displayed on the Binary Association shape
Right-click the shape, click Shape Display Options, and then select or clear options to show or hide values.
Navigate to other views of the binary association
Right-click the shape, click Views, select the view you want, and then click OK.