Some possible scenarios of the system are explained as follows : Here, we will try to understand the design of a use case diagram for the Online Banking System. The Use- Case Diagram for an Online Banking System is as follows : Here LOGIN is the Base Use Case and INVALID PASSWORD is Extended Use Case. However under certain situations it might use action corresponding to INVALID PASSWORD. However if the details entered by the user are incorrect, software must be able to catch and display problem to the user and allow the user to re-enter details. If a user enters appropriate details, user is allowed to Login. Here LOGIN is the Base Use Case and AUTHENTICATE is the Included Use Case. Software must check and verify the details at every attempt to Login.
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