On UML Relationships

Keywords
Association
Association - Role: each class in an association plays a role (the text inside the class rectangles describes the role)

Qualifier: solves the lookup problem by providing information the association uses to perform its operation
Multiplicity
Constraints on Associations
Association classes
Reflexive Associations
Generalization (Inheritance)
Dependency (coupling): A dotted line extending from a class method into another class with a hollow arrow terminating the line (this shows that the method uses the class)