An object-oriented relationship specifying that two classes have some relationship, but it is not an inheritance, containment, or uses relationship.
- Descriptive attribute
An attribute whose only purpose is to describe some feature of the objects that belong to the class.
- Referential attribute
An attribute whose purpose is to allow an object of a class to get access to an object of another class.
- Simple association
A term used in some object-oriented methodologies to describe an association that is not reducible to any of the other object-oriented relationships.