![]() ![]() A use case is an external view of the system that represents some action the user might perform in order to complete a task. The two main components of a use case diagram are use casesand actors.Īn actor represents a user or another system that will interact with the system we are modeling. A use case diagram displays the relationship among actors and use cases. ![]() Generally, both graphical notation and descriptions are important as they document the use case, showing the purpose for which an actor uses a system.Ī use case is a set of scenarios that describing an interaction between a user and a system. One complaint about the standards has been that they do not define a format for describing these use cases. Both the UML and SysML standards define a graphical notation for modeling use cases with diagrams. Use Case diagrams are formally included in two modeling languages defined by the OMG. ![]() Its purpose is to present a graphical overview of the functionality provided by a system in terms of actors, their goals (represented as use cases), and any dependencies between those use cases. In software engineering, a Use Case Diagram is a type of Behavioral UML diagram defined by and created from a Use-case analysis. ![]()
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