analysis

[drak3]

Hello,

I was wondering if any members are into analysis. I am preparing a UML use case diagram for the visa paywave cashless payment system as part of an exercise.

The problem is, I am not sure if the scanner interface and the online management of the card (web site) are outside of system boundary and act upon the system as actors?

Any help appreciated

 

[drak3]

My thinking was that, users will be actors on the scanner and online interface. Then, the scanner and online interfaces will be actors on the internal system.

For example, a user can trigger the use case "purchase" on the scanner subsystem. Then, in turn, the scanner (which is a subsystem) will trigger the use case "process payment" on another subsystem.

Working together the subsystems achieve the goal of the system.

I am on the right track you think?

edit:
The confusing bit is how you model an interface in a system. An online account management website is part of the system, however, the web site just communicates with the server. The user acts on the web site, and then is the web site that acts on the server.

this is what confuses me

thanks for any help