The assumption that the user has been signed in is not always true. For
example, many travel sites allow users to check flight availability without
login, but required users to login when they are ready to save the
itinerary. In the prepare itinerary use case, the login is executed only
when the user saves the itinerary without login. I am having difficulty of
thinking login as a pre-condition for this use case.
> -----Original Message-----
> From: Steven Dearborn [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, March 13, 2001 6:27 PM
> To: Logan Wilkins
> Cc: Maheswari Subburaman; [EMAIL PROTECTED]
> Subject: RE: (ROSE) Whether Login and Logout are usecase or
> pre-condition and post-condition?
>
>
> The REQUIREMENT is that the user has been identified and authenticated.
>
> Ths SuD knows who they claim to be and that they are who they state that
> they are.
>
> Log-in is one of many means to implement this requirement.
>
> This will allow your implementations to handle identification and
> authentication via smart-card, biometric, etc. later, without going back
> and changing the requirement. (The requirement to identify and
> authenticate users did not change, the implementation did.)
>
> The assumptions is that the user has been identified and authenticated.
>
> The basic course of your use case now proceeds with the business level
> transaction.
>
>
> On Tue, 13 Mar 2001, Logan Wilkins wrote:
>
> >
> > Maheswari:
> >
> > My $.02 are that Login is a valid precondition. I use all sorts of
> > preconditions to get to the stage of the system where I want to begin my
> use
> > case. For example:
> >
> > Preconditions:
> > - User has logged in
> > - User has clicked on Main Order Form
> > - User has entered at least one valid hardware part number
> >
> > Why not use them? They are unambiguous (or should be) and make it very
> easy
> > to get to the action that I want to describe. I advise against making
> > writing use cases harder than it needs to be. Keep it simple.
> >
> > Also, IMHO Login is a valid use case. The value it provides is that the
> user
> > gains access to a restricted system.
> >
> > Logan Wilkins
> > Ciso Systems
> >
> >
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]]On Behalf Of Maheswari
> Subburaman
> > > Sent: Tuesday, March 13, 2001 2:10 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: (ROSE) Whether Login and Logout are usecase or pre-condition
> > > and post-condition?
> > >
> > >
> > >
> > > Hi Everyone,
> > >
> > > I know this question came on the forum many times,
> > > still it troubles me to decide Login and Logout either
> > > as independent use cases or just pre and post conditions
> > > of other usecases which actually carry out the functionality
> > > of the system or solve the purpose of the User.
> > >
> > > In one of the earlier questions I knew Login was taken as
> > > a use case and then was considered as Pre-condition of
> > > other use cases. But I am not able to get convenienced
> > > that "Login" can be a usecase itself , since it indepenently
> > > does not return some thing useful to the Actor. The actor
> > > is going to access the required useful information only
> > > after Login.
> > >
> > > For example I have a usecase "View race Information"
> > > which is initiated by the actor known as "Member" .
> > > To view this information the the member must have already
> > > logged in. But I don't want to make Login as a separate use case,
> > > because it does not return any thing to the actor as such.
> > >
> > > Now the problem is if Login is not a use case then what it is?
> > > Where I can have it? If I can have it as a pre-condition then
> > > I am worried where the flow of events which take place during
> > > Login can be accomodated.
> > >
> > > Any suggestion most welcome.
> > >
> > > Thanks
> > > Maheswari
> > >
> > >
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