I am developing a timetable app for the college. System needs to notify the users about class before 15 minutes and should turn mobile to silent mode during the classes automatically. How can I represent these requirements in use case diagram. Can I make system an actor to show system triggers the alarm and turns mobile to silent mode?
Using system as actor in use case diagram
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If your timetable application should notify users, than you must define usecase of this application for example "Notification" with two actors. Actor "User" notified by app, and actor time defined as "15 minutes before class". Time actor initializes UseCase as well. See UML superstructure UseCases/Actor section.
Same idea as Vladimir's. This is how I would draw..