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.
