It is best if you do not think of the associations between actors and use cases as "works on" but rather "is involved in" or "involves". In this way you can see that both actors (Actor and Sys_B) are involved in the use case. You can read into it further that it is Actor who initiates the use case by the presence of an arrow head on his association with the use case. Remember arrow heads in use cases are nothing to do with the flow of communication. So it would in fact read as Actor initiates the use case and Sys_B is involved in it.
0 0 -|- ------------> UC01_Sys_A -------------------- -|- | | / \ / \ Actor Sys_B Hope this helps explain it a little more clearly James -----Original Message----- From: Pankaj Chatterjee [mailto:[EMAIL PROTECTED]] Sent: 11 December 2001 13:03 To: 'Rose Forum' Subject: RE: (ROSE) Actors - Use Case and Other System Hello James, I also thought of modeling Sys_A as you have suggested, but I am confused a little. My understanding was that An actor works on a use case and not the other way around. However modelling ( Actor ---> UC01_Sys_A ---> Sys_B) makes Sys_B as an actor and it appears the Use Case working on the Actor. How is this model to be read? Pankaj -----Original Message----- From: Baynes, Steve [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 11, 2001 4:35 PM To: 'Pankaj Chatterjee' Cc: 'BOWMAN, James' Subject: RE: (ROSE) Actors - Use Case and Other System I agree with James. His answer fits your explanation and it is what I would do. Regards Stephen Baynes -----Original Message----- From: BOWMAN, James [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 11, 2001 10:01 AM To: 'Pankaj Chatterjee'; 'Rose Forum' Subject: RE: (ROSE) Actors - Use Case and Other System I would model Sys_B as an actor. In UML an actor may represent either a user of an external system. This means that in the Sys_B model, Sys_A is the actor for UC02. Therefore I would represent it as follows: In model for Sys_A: 0 0 -|- ------------> UC01_Sys_A -------------------- -|- | | / \ / \ Actor Sys_B And then in model for Sys_B: 0 -|- ------------> UC02_Sys_B | / \ Sys_A Hope this helps James -----Original Message----- From: Pankaj Chatterjee [mailto:[EMAIL PROTECTED]] Sent: 11 December 2001 07:43 To: 'Rose Forum' Subject: (ROSE) Actors - Use Case and Other System Hi all, Suppose there are two systems Sys_A and Sys_B. Consider also a Use Case UC01_Sys_A in the Sys_A system. Now consider that an actor will initiate the UC01_Sys_A, this use case does some work and also raises an event that will cause some processing in Sys_B ( lets say UC02_Sys_B) . The question is the how to represent this situation? Understand that there are two models being generated, one for each system. Therefore from Sys_A point of view what is Sys_B and what is the event that the UC01 raises? >From Sys_B point of view who is the actor for UC02? 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