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Visual Modeling with Rational Rose 2002 and UML by Terry Quatrani

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Association Classes

A relationship may also have structure and behavior. This is true when the information deals with a link between two objects and not with one object by itself.

Consider the following example: A student may take up to four course offerings, and course offering may have between three and ten students. Each student must receive a grade for the course offering. Where is the grade held? It doesn't belong to the student since a student will probably have different grades for different course offerings, and it doesn't belong to the course offering since a course offering has different grades for different students. The information belongs to the link between a student and a course offering. This is modeled as an association class. ...

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