How to Model Permissions on Use Case for Actors

In use case diagram, associations between actors and use cases are explicitly shown. We can see it clearly when an actor carries out a use case (or goal) from a line drawn between them. However, what if an actor does not carry out a use case but do refer to the output from it? How do we model that?

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Group Generalizations with Generalization Set

When working on a use case diagram, you may have a superactor with a few subactors underneath from generalization. For formatting purpose, you may want to group the lines of generalization together for a more organized presentation.  This can be done by creating a generalization set.

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