Frank
I completely agree with you that we should look beyond the implementation to
find the interested party, and that this interested party would be the
Actor.
However, isn't it often the case that the passage of Time can trigger the
interaction of the interested party?
e.g. the passage of 3 days since delivery of goods triggers the interaction
of the supplier requesting payment.
Use Case - Deal with Payment Request
Actor - Supplier
Trigger - Time (passage of 3 days)
I really don't have a fixed view on this.
I am looking for your opinion, and that of others.
James Shields
PS I did read all of your message, but I just wanted to focus on one
important part of it.
-----Original Message-----
From: Michael Hill [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 22, 2001 3:59 PM
To: Shields James; Frank I. Reiter; [EMAIL PROTECTED]
Subject: RE: (ROSE) Use cases: When its not clear who gets the value
Well yes initially, but then no. I don't have a good look at the system
that is being build. I said COULD by used not necessarily be used. Read my
whole explaination not just the first part.
I would have to question, why their is a Trigger and who would get the
result of this trigger. Time trigger is just an implementation. I guess
what I am trying to say is that lets look beyond the implementation of a
Time Trigger, and lets look at the result of this trigger and who is
interested by this. This interested party would be the actor.
-----Original Message-----
From: Frank I. Reiter
Sent: Wed 3/21/2001 3:41 PM
To: [EMAIL PROTECTED]
Cc:
Subject: (ROSE) Use cases: When its not clear who gets the value
Michael
Do you really see Time as an Actor?
I tend to think of Time as a Trigger.
I would be interested in hearing more.
Thanks.
James
-----Original Message-----
From: Michael Hill [ mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> ]
Sent: Thursday, March 22, 2001 1:32 PM
To: Frank I. Reiter; [EMAIL PROTECTED]
Subject: RE: (ROSE) Use cases: When its not clear who gets the value
Lets remember what the sytem boundaries are to the system that you are
building. Time is orginated from the OS and below, so an actor of Time
could be used. I would be careful how I describe the actor of Time. A
clear definition should be documented for the actor Time. It is really a
common problem that I have seen. I have seen several systems deing defined
that an actor Time is needed. But also you should look at it a bit farther,
it is Time or something else. Does the result get passed back to an another
actor? If so, that actor will initiate that Use Case.
I hope this sheds some light on this.
-----Original Message-----
From: Frank I. Reiter
Sent: Wed 3/21/2001 3:41 PM
To: [EMAIL PROTECTED]
Cc:
Subject: (ROSE) Use cases: When its not clear who gets the value
I'd like to hear some opinions about how to handle something that has me a
bit stumped.
I am writing use cases for a system. For the most part I am finding that
pretty straight forward. In one instance however there is behaviour that I
want to document and I can't see quite how to make it a use case. (On
possible answer is that I shouldn't try!)
The system has a cache of data which originates elsewhere and can change
over time. Periodically the system checks with the source of truth for
updates. The question that really stumps me is "Who is the actor in this
use case?"
The obvious answer is time or the system clock. I don't really want to do
that because the rule of thumb that resonates best with me is that the actor
is a party outside of the system that gets value from the use case. Time
gets no value from this.
So who does?
Well, I could say that the system does. That would make this a use case of
the external system, with my system as the actor, rather than a use case of
my system. That wouldn't really belong in my document.
Various users benefit in that they are working with more up to date data,
but they get that value through other use cases already written. They do
not participate in this use case at all.
How do people handle this?
Frank.
-----
The very act of seeking sets something in motion to meet us;
something in the universe, or in the unconscious responds as if
to an invitation. - Jean Shinoda Bolen
************************************************************************
* Rose Forum is a public venue for ideas and discussions.
* For technical support, visit http://www.rational.com/support
<http://www.rational.com/support>
< http://www.rational.com/support <http://www.rational.com/support> >
*
* Admin.Subscription Requests: [EMAIL PROTECTED]
* Archive of messages:
http://www.rational.com/products/rose/usergroups/rose_forum.jtmpl
<http://www.rational.com/products/rose/usergroups/rose_forum.jtmpl>
< http://www.rational.com/products/rose/usergroups/rose_forum.jtmpl
<http://www.rational.com/products/rose/usergroups/rose_forum.jtmpl> >
* Other Requests: [EMAIL PROTECTED]
*
* To unsubscribe from the list, please send email
*
* To: [EMAIL PROTECTED]
* Subject:<BLANK>
* Body: unsubscribe rose_forum
*
*************************************************************************
************************************************************************
* Rose Forum is a public venue for ideas and discussions.
* For technical support, visit http://www.rational.com/support
*
* Admin.Subscription Requests: [EMAIL PROTECTED]
* Archive of messages:
http://www.rational.com/products/rose/usergroups/rose_forum.jtmpl
* Other Requests: [EMAIL PROTECTED]
*
* To unsubscribe from the list, please send email
*
* To: [EMAIL PROTECTED]
* Subject:<BLANK>
* Body: unsubscribe rose_forum
*
*************************************************************************
