Directed Association Relationships

A directed association is an association relationship that is navigable in only one direction, indicating that the control flows from one classifier to another (for example, from an actor to a use case). This means that only one of the association ends has navigability set for it. For details, see Specifying Navigability in Associations.

An example directed association can be found in an e-commerce application. A "Store Manager" actor connects to a target classifier "Price Override" with a directed association. Control can only flow in one direction; only the store manager can override the price of an item.

A directed association appears as a solid line with an arrowhead near the shape to which navigation flows.

You can name any association to describe the nature of the relationship between the two classifiers; however, names are typically not needed, especially if you use association end names.

• Association Relationships
• Specifying Navigability in Association Ends
• Adding Shapes to Diagrams
• Aggregation Association Relationships
• Composition Association Relationships
• Specifying Kinds of Association Relationships |

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