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Difference between uses and extends usecase?

 
Ram Nath
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Can anyone tell me the difference between uses and extends usecase?
Is it, uses is used for 2 use cases use a common use case.
extends is for optional error handling?.
What is the diff between primary actor and secondary actor?
Is the secondary actor is the one having out going arrow from the system under consideration.
Thanks
Ram
 
Tim Grandison
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Can anyone tell me the difference between uses and extends usecase?
Is it, uses is used for 2 use cases use a common use case.
extends is for optional error handling?.
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Uses is an imprecise term for UML diagrams and typically should be avoided. Extends refers to some action or mini-use case that is optional (not necessarily just for error handling). If you have a use case for making a withdrawal from an ATM, you might extend that use case with a print balance use case. Note that the print balance would have to be optional in order to use "extends".
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What is the diff between primary actor and secondary actor?
Is the secondary actor is the one having out going arrow from the system under consideration.
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The primary actor is a person or a system that wants some goal accomplished by using your software system. A secondary actor is usually another software system that your code has to interact with in order to accomplish that goal.
 
Ram Nath
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Great explanation, Tim. Thanks a lot
 
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