Choose classes involved with the use case
Add use case controller
Elaborate attributes
Visibility, type-expression, initial-value, property
Establish first-cut navigation visibility
One-to-many relationships usually navigated from superior to subordinate
Mandatory relationships usually navigated from independent to dependent
When an object needs information from another object, navigation arrow points to the object itself or to its parent in hierarchy
Navigation can be in both directions (arrows bidirectional)