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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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 ...