UML USE CASE DIAGRAMS

A UML Use Case diagram is a type of behavioral diagram defined by and created from a Use Case analysis. 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. http://en.wikipedia.org/wiki/Use_case_diagram
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use-case Templates

UML Use Case Diagrams Explained

Use Case diagrams are used to identify the primary elements and processes that form the system.

Use case diagrams are great storyboard tools for user meetings. They define the requirements of the system being modeled and hence are used to write test scripts for the modeled system.

UML Use Case Diagram Objects Explained

Visit the UML Use Case Objects page to get an understanding of all the objects used for UML Use Case diagramming.

A catalogue of the primary elements used fro Use Case diagrams that can be found in the Creately library are discussed in detail here.

Examples and Using use-cases in the real world

Articles, Tutorials & Blog posts on use-cases