In software and systems engineering, a use case is a list of steps, typically defining interactions between a role and a system. From Wikipedia: http://en.wikipedia.org/wiki/Use_case

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How to manage and estimate unstructured requirements received from customers

A lot of the times during the bidding phase of a project I receive a software system's requirements from our potential customers in a very unstructured format from various sources [email, word ...
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When, if ever, should I draw the use-case diagram of the existing system?

When I want to design a software I usually think about the use-cases of my software, but I have heard some sort of analyzing the existing (non-automated) system is required. To be specific, is ...
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How to capture “Display advertisement” use case?

What kind of use case it would be for to "show ad in part of the view"? Who could be the actor to relate with? User or System? As user has no specific goal to see ads, i am wondering what is the best ...
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Use case notation for login

When a login is needed in a system to perfom any action. How do you express that in a Use Case Diagram? I have a system that will allow employees to perform sells. They must be logged in, but once ...
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Use Cases with respect to downstream systems

Use cases are primarily meant for interaction between user and a system. It could be used for interaction between system and another system. The actors are primarily roles. It is easy to document ...