I am working on a use case diagram for a library system. I have student and teacher actors. The students can only borrow certain books and the teachers can borrow all books. What is the best way to illustrate this?
I currently have "staff" and "student" actors that can "search catalog" but I am unsure on how to then go on to show books each different actor is allowed to borrow.
Any pointers would be greatly appreciated.
Agree with @qwerty_so on this one, it's the simplest solution available. If you want to complicate things, you can create abstract use case Borrow a book and specialize it into two use cases Borrow any book and Borrow ??? book. Replace ??? with proper adjective. Associate use case Borrow any book with Teacher actor and use case Borrow ??? book with Student actor.
When writing use cases, I tend to use use case specialization when a condition (in this case actor being the Student) leads to more significant changes than wording of one use case step. One example of such change might be the need to write a failure scenario called User chooses inaccessible book that is only relevant for Borrow ??? book use case.
