Case Uses

Assignment 2: Use Cases

This use case describes how the Bank Customer uses the ATM to withdraw money his/her bank account. The actors are the bank customer and the bank. Some of the preconditions that already in use is that there is an active network connection to the Bank, and the ATM has cash available.

In this use case the basic flow of events consists of the following: (1) the use case begins when bank customer inserts their bank card; (2) Use Case: Validate User is performed; (3) The ATM displays the different alternatives that are available on this unit. In this case the Bank Customer always selects “Withdraw Cash”; (4) the ATM prompts for an account; (5) the bank customer selects an account; (6) the ATM prompts for an amount: (7) the bank customer enters an amount; (8) card id, pin, amount and account is sent to Bank as a transaction. The Bank Consortium replies with a go/no go reply telling if the transaction is ok; (9) then money is dispensed; (10) the bank card is returned; (11) the receipt is printed; and finally (12) the use case ends successfully.

Some alternative flows that might happen is (1) invalid user- if in step 2 of the basic flow bank customer the use case: validate user does not complete successfully, then the use case ends with a failure condition. (2) wrong account- if in step 8 of the basic flow the account selected by the Bank Customer is not associated with this bank card, then the ATM shall display the message “Invalid Account – please try again” or the use case resumes at step 4. (3) wrong amount-if in step 7 in the basic flow, the Bank Customer enters an amount that can't be 'created' with the kind of in the ATM, then the ATM shall display the message indicating that the amount must be a multiple of the bills on hand, and ask the bank customer to reenter the amount, then the use case resumes at step 7. (4) Amount exceeds withdrawal limit- if in step 7 in the basic flow, the bank customer enters an amount that exceeds the...