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What is generalization use case diagram?
In the context of use case modeling the use case generalization refers to the relationship which can exist between two use cases and which shows that one use case (child) inherits the structure, behavior, and relationships of another actor (parent).
What is the relationship between use case and actors in use case diagram?
Each use case represents a unit of useful functionality that subjects provide to actors. An association between an actor and a use case indicates that the actor and the use case somehow interact or communicate with each other. Only binary associations are allowed between actors and use cases.
What are the UML 2 use case diagramming guidelines?
UML 2 Use Case Diagramming Guidelines. A use case diagram is “a diagram that shows the relationships among actors and use cases within a system. “Use case diagrams are often used to: Provide an overview of all or part of the usage requirements for a system or organization in the form of an essential model or a business model.
What are the relationships on a use case diagram?
There are several types of relationships that may appear on a use case diagram: An association between an actor and a use case. An association between two use cases. A generalization between two actors. A generalization between two use cases.
Are there any generalization / specialization use case diagrams?
Note: There is no generalization / specialization in the As-Is diagram (Figure 1). The Customer actor covers all purchasers of gasoline regardless of age. The same generalization / specialization technique is used for the use cases. The specialized behavior use cases are Purchase Fuel and Purchase Lottery Ticket.
How is an actor in a USE CASE MODEL?
An actor specifies a role played by a user or any other system that interacts with the subject. It may represent roles played by human users, external hardware, or other subjects. Actors are always outside the system and interact directly with it by initiating a use case, provide input to it, and/or receive outputs from it.