Use Cases

Use Case Analysis • Use case (Stories of using the system) is a technique to understand requirements • Mainly deal with the functional requirements of the system Use Case Analysis • What is a Use Case? – A sequence of actions a system performs that yields a valuable result for a particular actor. – E.g. register for a course – Process Sale • What is an Actor? – A user or outside system that interacts with the system being designed in order to obtain some value from that interaction – e.g. Student , Clerk Use Case Analysis • What is a Scenario ? Specific sequence of actions and interactions between actor(s) and system (= one story; success or failure) • Use Case is a collection of related success and failure scenarios describing the actors attempts to support a specific goal • The UP defines the use cases with in the requirements discipline. • Use Cases describe WHAT the system will do, but never describe HOW it will be done. • The Library System is used by the ABC College students and Faculty. The Library contains Books and Journals. • Books can be issued to both the Students and Faculty. Journals can only be issued to the Faculty. • Books and Journals can only be issued by the Librarian. The deputy-Librarian is in-charge of receiving the Returned Books and Journals. • The Accountant is responsible for Receiving the fine for overdue books. Fine is charged only to students, and not to the Faculty.