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5 uml use case diagrams

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“It’s a diagram that shows relationships between actors and uses cases in a system.” UML Use Case Diagram 1 What is a use case diagram?  “It’s a diagram that shows relationships between actors and uses cases in a system.”  “A use case diagram is a visual representation of the relationships between actors and use cases together that documents the system’s intended behavior”  Use case diagrams are used during requirements elicitation and analysis as a graphical means of representing the functional requirements of the system.  Use cases are developed during requirements elicitation and are further refined and corrected as they are reviewed (by stakeholders) during analysis. UML Use Case Diagram 2 Use Case Diagrams  Description of a system’s behavior as it responds to a request that originates from outside of that system. Describes a set of sequences.  Each sequence represents the interactions of things outside the system (actors) with the system itself (and key abstractions)  Use cases represent the functional requirements of the system (non-functional requirements must be given elsewhere) UML Use Case Diagram 3 Use case A Use Case  Each use case has a descriptive name  Describes what a system does but not how it does it.  Use case names must be unique within a given package  Examples: withdraw money, process loan  The use case names starts with a strong verb UML Use Case Diagram 4 Actor  Actors have ...
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