Actors are external to the system being developed. Modeling the system under development as an Actor simply doesn't make sense. Use Cases provide results of observable value to an Actor. If a process doesn't provide some result of value, then it isn't a Use Case for that system. The composition of Use Cases represents the system under development.
Kirk Knoernschild
Senior Consultant
TeamSoft, Inc.
www.teamsoftinc.com
www.kirkk.com
Consulting, Training, & Mentoring
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* The opinions expressed are mine, and do not necessarily
* represent those of my employer.
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-----Original Message-----
From: Eric D. Tarkington [SMTP:[EMAIL PROTECTED]]
Sent: Monday, February 26, 2001 4:00 PM
To: ROSE_FORUM
Subject: (ROSE) "System" as Actor
When drawing their first use case diagrams, my students (including some
of my best) sometimes identify the system under development as an actor.
I've been telling them not to do this, since my favorite sources don't
do it, but lately it has been bothering me.
When the system is doing something like scheduling activities for
regular or delayed execution, I have seen authorities use a "system
clock" actor. Also, in some environments it is quite right to say that
the system provides services such as printing. If the system looks like
an actor, walks like an actor, and quacks like an actor, what is it?
-Eric
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