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system vs. business use case

 
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Hi All ,
Can some one please tell me the difference between a system use case and a business use case? If possible with some example please
Thanks in advance
Regards
Johnson
[edited to give it a more significant subject - Ilja]
[ November 19, 2003: Message edited by: Ilja Preuss ]
 
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Hi,
A business use case, is a simplified, abstract, generalized use case that captures the intentions of a user in a technology and implementation independent manner.
The system use case has many implementation details embedded within it.
 
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Originally posted by Krishna Neeraj:
Hi,
A business use case, is a simplified, abstract, generalized use case that captures the intentions of a user in a technology and implementation independent manner.
The system use case has many implementation details embedded within it.


The business use case tells you what your users want to have built.
U therefore can express your requirements as business usecases.
A system use case is describes the system you are going to build to cater the requirement your user has stated in his business use case.A system use case will therefore include high level implementation details like specific references to UI screens if your system has a user interface.
 
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It depends entirely on the book you're reading or who you're talking to at the moment. I avoid using the terms because I have no idea what they mean to anyone I'm talking to, which means I'm probably not communicating.
Alistair Cockburn defines five levels of abstraction in use cases. "Sea level" is the "just right" level for requirements analysis. Our team defines it as flows that describe an actor using the system under discussion to accomplish a business goal but with no implementation details like screens, buttons, checkboxes, databases, etc. Above that are "kite" and "cloud" levels. Clouds describe business flows without referencing systems at all. Below are "fish" and "clam" levels that get into implementation details. We like "fish" level docs to describe screens, fields, buttons, etc.
The names are silly, but who says there can be no levity in application development? They are a good mnemonic to remember relative levels of abstraction or detail.
 
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Are business and system use case synonymous with functional and non-functional requirement?
 
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Originally posted by Ashish Pagare:
Are business and system use case synonymous with functional and non-functional requirement?


From the above descriptions I'd think they are not. Why would they?
 
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A business use case describes a (detailed) business process involving actors and activity steps. There does not have to be any computer-based systems involved here at all. On the other hand, a system use case describes the behaviour and scope of a (computer-based) system. Hence these different kind of use case models have different purposes.
Use case models normally focus on functional requirements, that is what a system should do as a response to user input. Other kinds of models are neccessary to address non-functional requirements.
[ December 04, 2003: Message edited by: Stefan Sorman ]
 
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I agree with Stefan Sorman. For example in the Petstore example
we can write the Business Use Case as:
customer -> ( purchase pets ) << include >> ( process order )
and system use case as:
OrderProcessingSystem -> ( process order )

Nalla
[ December 04, 2003: Message edited by: Nalla Senthilnathan ]
 
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