Example Of Use Case Diagram With Scenario. Use cases and scenarios. A use case diagram should describe at least a single module of a system.
For example a system use case might be return book when overdue and would describe the interactions of the various actors borrower librarian with the system in carrying out the end to end process. In simple words a use case is a goal with various processes and a case scenario represents a linear and straight path through one of the operations. A use case diagram should represent all interactions with the use case.
These are diagrams that can be used to more clearly illustrate the set of use cases that are.
Used to get an outside view of a system. A use case diagram should represent all interactions with the use case. They enable you to visualize the different types of roles in a system and how those roles interact with the system. A use case can have multiple paths to reach the goal.
