June 2005
Intermediate to advanced
236 pages
6h 27m
English
Content preview from UML 2.0 in a NutshellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Use Case Scope
As mentioned previously, a use case is a distinct piece of functionality, meaning it is of sufficient granularity that the user has accomplished his desired goal. Proper scoping of use cases is an art, but UML sets several requirements to make the job a little easier:
A use case must be initiated by an actor.
When a use case is considered complete, there are no further inputs or outputs; the desired functionality has been performed, or an error has occurred.
After a use case has completed, the system is in a state where the use case can be started again, or the system is in an error state.
One popular rule of thumb is to ask yourself if the user can "go to lunch" after completing the use case, meaning that a reasonably sized goal has been achieved by the initiator. For example, Add item to shopping cart is probably not the larger goal a user intends; Purchase item is likely a better scope. Purchase item can consist of adding an item to a shopping cart but typically has more functionality such as logging on, entering billing and shipping information, and confirming the order.
Above all, use cases are intended to convey desired functionality, so the exact scope of a use case may vary depending on the intended audience and purpose for modeling.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.