![]() The arrowheads are typically confused with data flow and as a result I avoid their use. ![]() The arrowhead is often used to indicating the direction of the initial invocation of the relationship or to indicate the primary actor within the use case. Associations are modeled as lines connecting use cases and actors to one another, with an optional arrowhead on one end of the line. An association exists whenever an actor is involved with an interaction described by a use case. Associations between actors and use cases are indicated in use case diagrams by solid lines. ![]() An actor is a person, organization, or external system that plays a role in one or more interactions with your system. A use case describes a sequence of actions that provide something of measurable value to an actor and is drawn as a horizontal ellipse. Figure 1 provides an example of a UML 2 use case diagram.Use case diagrams depict: They are useful for presentations to management and/or stakeholders, but for actual development you will find that use cases provide significantly more value because they describe “the meat” of the actual requirements. ![]() UML 2 use case diagrams overview the usage requirements for a system.
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