Of course the observable result is different! Your basic flow and alternate
flow will give you different observable results! Should you split them into
different use case? Definitely Not. The What are flows and what are use
cases depends on the value it brings to the actor. The "complete sequences
of events" that are "of value to the actor". Focus on the larger picture on
what the actor wants.
-----Original Message-----
From: Michael Hill [mailto:[EMAIL PROTECTED]]
Sent: 30 November 2000 20:45
To: 'Ng, Pan Wei '; Michael Hill
Cc: '[EMAIL PROTECTED] '
Subject: RE: (ROSE) Use Cases and UC Diagram
But the observable result would be different for "Update", "Add", etc. If
the result is different, then you have broken the definition of a Use Case.
-----Original Message-----
From: Ng, Pan Wei
To: Michael Hill
Cc: [EMAIL PROTECTED]
Sent: 11/30/00 6:46 AM
Subject: RE: (ROSE) Use Cases and UC Diagram
Hi,
The definition of a use case is A SEQUENCE OF EVENTS PERFORMED BY THE
SYSTEM
THAT YIELDS AND OVSERVABLE RESULT WHICH IS OF VALUE TO THE ACTOR. Focus
on
the phrase "of value to the actor". Is adding records by itself of value
to
the actor? Think of a system in context. If it can only add records, but
cannot browse, delete, edit. Is it of value to the actor. If it is, I
agree
with you. BUT IN MOST cases, what the actor wants is to be able to
mantain
records, Add, Delete, Update, Browse and Search, and use case like this
in
most cases are NOT BIG.
Cheers
--Pan-Wei Ng
Rational Software (Singapore)
-----Original Message-----
From: Michael Hill [mailto:[EMAIL PROTECTED]]
Sent: 30 November 2000 20:33
To: 'Ng, Pan Wei '
Subject: RE: (ROSE) Use Cases and UC Diagram
I disagree with what was stated below, Update Records, etc. are not
flows
in the Use Case. Think about you alternalte flows or exceptional flows,
it
would cause the Use Case to be to big. Split them up in smaller Use
Cases.
-----Original Message-----
From: Ng, Pan Wei
To: CHIAM CHOON YEE, LSD; '[EMAIL PROTECTED] '
Sent: 11/29/00 9:28 AM
Subject: RE: (ROSE) Use Cases and UC Diagram
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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