ATM Case Study. A Discussion. Case Study.
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A Bank wishes to introduce ATM service to provide limited facilities to her customers. Customers may get ATM cards on request. Users may view their balance or transfer or withdraw money using these cards. Cards may be used to access many accounts and an account may be accessed using different cards. A card may be blocked temporarily or permanently (e.g. If it is lost) by the Bank. A PIN is associated with each card to verify the authority of the user. There is an OD limit associated with each cheque account. Theoretically, any amount may be withdrawn from a cheque account at any time (provided it is less than the balance+Odlimit). There is no OD facility for a savings account.
The personal information of the customers and their account details are already maintained by the Bank’s main system. A subsystem is required to handle the ATM’s functionality. Two hardware systems Card reader and Money dispenser will communicate with this subsystem. The card reader reads the Card’s ID and passes it to the system. It is also able to eject the card when an eject signal is received from the system. Similarly the money dispenser is able to dispense the required amount of money.
The Limited ATM system is required to provide at least the following operations.
The validity of the card and the authority of the
User will be checked for each transaction session.