We use Shlaer Mellor OOA to break down a complex system into domains (subject
matters).
Each of these subject matters is analysed as a system in its own right....each with
their
own set of use cases. The application level use cases would be huge and useless and
unmanageable without breaking the system down into lower level use cases. And even
within
these domains, if the system is compex enough or if the use cases have similar
functionality
that can be broken into lower level use cases then do it (I'm not talking about
breaking it
down anywhere near function level though). It makes the development easier. Call it
"functional decomposition" if you want ....... what's wrong with it? If you look at
Alistair
Cockburn' s use case papers he certainly describes various levels of use cases
(summary,
user goals and tasks). If it helps to solve a complex problem then use it.
Cheers,
Jeff
"Ng, Pan Wei" wrote:
> Hi,
>
> Your suggested approach is what we call "functional decomposition". This is
> actually one of the pitfalls of mis-applying use cases. Your update records,
> delete records, add records and view records are flows of events within the
> Maintain Employee Records use case. Each of them is documented as an
> interaction diagram, not a use case.
>
> What you can do is as follows: Right Click use case. Select New-->Create
> Sequence Diagram, and rename them as update records, delete records, add
> records and view records respectively.
>
> Cheers
> --Pan-Wei Ng
> Rational Software (Singapore)
>
> -----Original Message-----
> From: CHIAM CHOON YEE, LSD [mailto:[EMAIL PROTECTED]]
> Sent: 29 November 2000 21:59
> To: '[EMAIL PROTECTED] '
> Subject: (ROSE) Use Cases and UC Diagram
>
> From what I understand, Use Case Diagram captures all the use cases which
> describes the functionalities of the system in relation to the system.
> Usually, I would want to keep the main use case diagram uncluttered, simple
> and neat. However, when I do that, I lose the details.
> As an example, I use "Maintain employee records" as a use case. In this use
> case, I actually have
> * update records
> * delete records
> * add records
> * view records
>
> Is there any good way to layer the use cases conveniently? That is, I click
> into one particular use case, if there is a layer of use case diagram below
> it, the diagram will be blown up?
>
> Thanks.
>
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--
<X><<>><X><<>><X><<>><X><<>><X><<>><X>
Jeffrey James, Sr Design Engineer
Tait Electronics Ltd.
Christchurch, New Zealand
<X><<>><X><<>><X><<>><X><<>><X><<>><X>
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