An association is a relationship between things in the problem domain. It is the term used by UML. 14. How would you describe or name the association between a ship and a captain? A captain is in charge of a ship. or A captain directs a ship. 15. What is the term used for association by traditional analysts and database analysts? It is called a relationship. 16. What is multiplicity, and what is the other term used by traditional analysts and database analysts? It is a measure of the number of links in an association between an object in one class and the objects in another class. In traditional analysis it is called cardinality.