Please note that <<extends>> is not 'Specialisation . <<extends>> simply
tells that the other use case behaviour is optionally extended from the
parent usecase.
I doubt whether even <<includes>> can be classified as aggregation though it
looks alright prima facie!!!
Prabhu
> -----Original Message-----
> From: Jason Gorman [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, January 02, 2001 8:41 PM
> To: Prabhusivakumar
> Cc: [EMAIL PROTECTED]
> Subject: RE: (ROSE)Association and Dependency in UseCases
>
> Who knows? <<includes>> denotes aggregation of use cases (one use case is
> part of another use case) and <<extends>> denotes specialisation (one use
> case is a special case of another). You have to be very careful how you
> use
> these, in much the same way as you must be with classes. Having said that,
> try building a class model with just loose dependancies and no
> associations!
>
> Jason Gorman
> http://www.xml-objects.com
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Prabhusivakumar
> Sent: 02 January 2001 08:47
> To: '[EMAIL PROTECTED]'
> Subject: (ROSE)Association and Dependency in UseCases
>
>
>
> Hi,
> Rational tells to use "Unidirectional Association" with stereo type as
> <<includes>> or <<extends>> between usecases.
> But as per Booch this is a "dependency". I also agree with Booch because
> if
> there is a change in the included usecase the main usecase is bound to get
> affected.
> But why still Rational recommends the use of Unidirectional Association??
>
> Prabhu
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