Use Case Diagram
A mind map about Use Case Diagram.
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Include the behaviour of one use case into the flow of another use case
Do not create a hierarchical functional decomposition of the system by splitting a use case into several use cases

Provides a way to insert new behaviour into an existing use case
Generally not a complete use case, therefore it cannot be triggered by an actor
You can choose whether or not to execute the extension use case



Start out with a verb, followed by a noun
Sub Topic
Use present tense for verb, do not use continuous tense

What can the system do?
What does the actor want the system to do?

One actor can participate in all the associations with use cases that the more general actor can, plus some additional use cases
Sub Topic
One use case provides all the functionality of the more general use case, and some additional functionality



Sub Topic




Used to help elicit requirements
Show how the user interface will look like for the client
Used to test out the system architectures for non-functional requirements

Who uses the system?
Who maintains the system?
Who owns the system?

What other system is the system using?

Helps model the analysis of usage requirements in the form of a system use-case model
Provide an overview of all or part of the usage requirements for a system
Helps communicate the scope of a project