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Use Case Model

Use Case Model in UML - OOAD Lecture Notes
Use Case Model 
Actor
  • Actor is something external to the system and interacts with the system 
  • Actor may be a human being, device or some other software system 
  • For library system, actors might be a 
➤Librarian 
➤Borrower 
Use case 
A use case represents sequence of actions performed by the system that yields an observable result of value for a particular actor. Use case represents a functional requirement of a system.
For library system, we can find the following use cases 
  • Login 
  • Search 
  • Browse 
  • Checkout item 
  • Return item 
  • Make reservation 
  • Cancel reservation 
  • Manage titles 
  • Manage items 
  • Manage borrowers 
  • Manage librarians
Use Case Diagram
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