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Adding Associations and Association Stereotypes

Multiplicity defines how many objects participate in a relationship.
  1. Multiplicity is the number of instances of one class related to ONE instance of the other class
  2. For each association and aggregation, there are two multiplicity decisions to make: one for each end of the relationship
  3. Although associations and aggregations are bi-directional by default, it is often desirable to restrict navigation to one direction
  4. If navigation is restricted, an arrowhead is added to indicate the direction of the navigation

Step through the process of adding associations and association stereotypes to the use case diagram:

Add an actor's association to a diagram

Represent the association of external systems

Add the Uses association stereotype

Add the Extends association stereotype