Use Cases

CIS210

ATM is an automated teller machine or also knows, as automated banking machine is an electrical telecommunication device, which makes the client to the financial transactions without a bank teller.

Actors
The following actors are involved in the use case of withdrawal action.
Bank Customer
Bank/Bank System
Preconditions
These are some preconditions for withdrawal of money from the bank.
The customer must have an ATM Card
The Machine must contain cash and be working properly
The machine must have a connection to the bank system

Post Condition The bank customer receives the withdraw amount that he wanted from the ATM with a receipt. The customer’s balance is then updated in the bank system.

Flow of Events

Insert the card The use case begins with the actor bank customer inserting the card into the card reader on the machine
Read the card The other actor the bank system reads the bank information off the card submitted.
Validate User The bank system allows the customer to enter a pin so the system can validate the customer’s identification

System Withdrawal The system displays the options, which are currently avaible in the ATM.

Select Amount The bank system displays the standard withdrawal amount on the screen for the customer to choose the amount to be withdrawn from the machine.

Withdrawal Confirmation After selecting the amount the system lets the customer recheck the amount and confirm the withdrawal by selecting conduct withdrawal option

Eject Card The system ejects the card of the customer so the customer can take it back from the machine.

Cash Give The system disburses the amount requested but the customer and prints a receipt slip containing the whole information of the account balance and the use case is done.

Alternative flows There are some alternative flows side by side, which are briefly discussed below only for the sake of information.
Invalid user, wrong amount entered by the customer, amount entered exceeds daily limit, insufficient cash in the account.

Account Deposit The customer can also deposit funds and other amounts through the ATM machine.

Actors
The same actors involved in the deposit amount use case
1. Bank Customer
2.Bank System

Preconditions The user is authenticated and it is a must condition or it

Post Condition The bank customer deposits the funds and the amount, which he wanted to deposit to the ATM machine and the customer is provided with the printed receipt. The customers account balance is updated in the systems.

Basic flow of events

The same functions performed in the start as in withdrawing. New events that are conducted

1. The use case begins with the customers, which inserts the card into the card reader.
2. The other actor named bank system will read the bankcard information from the card submitted into the card reader.
3. The system allows the customer to enter the pin so the system can validate the user and information.
4. User selects the deposit funds option
5. Bank system requests the account number of the customer
6. Customer enters the account number and lets the system verify the account numbers.
7. System request the customer to enter the amount
8. User enters the amount, which he wants to deposit
9. System updates the account balance
10. The system prints the receipt for the customer and ends the system

Alternative Flow
1. Invalid user
2. Rejected card because of wrong pin was entered
3. The system may fail to deposit the amount due to failure of the deposit slot
Amount Transfer
The customer can transfer cash to any of the accounts through the ATM Machine
Actors
The same actors are involved in the transfer event of the ATM Machine
1. Bank Custer
2.Bnnk System
Precondition
Her e the same authentication of the account is needed by the system to allow the transferring event.
Post Condition
The bank customer wants the system to transfer the amount to the account, which he wanted to, and make the system to perform the action. After transferring of that amount the customer is provided with the printed receipt, the account balance is updated in the system.
Basic flow of the event
1. The use case begins with the actor named bank customer, which inserts the card into the card reader of the atm.
2. The other actor named bank system reads out the bankcard information from the card submitted.
3. The system allows the user to enter the pin so the system can validate that user.
4. The customer choses the transfer option on the screen.
5. The customer chooses the account type to transfer the cash from the list displayed.
6. System wants the customer to choose a different account to which the amount is to be transferred.
7. Customer then chooses the amount, which he wants to transfer.
8. System sends the information, which includes the pin, account number, card number and the amount to the bank, which either accepts or declines the current transactions.
9. Receipt is printer for the customer.
Alternatives
Following are the main alternatives, which can occur.
1. Invalid user
2. The transaction failed in the information provided isn’t valid
3. The transaction only completes when the bank approves all of the information

Ethical Issue
The one ethical issue is that the use case exposes in connection with the development of the use of the ATM system is the authentication Customer
Banks face great problems concerning the authentication of the customer. People face problems in memorizing their pin numbers. As the privacy of the individual or the security of the dada and information provided to the bank system is the very important thing for an event and transaction. The accuracy of the data and the information is very basic and important thing. Data security, Data accuracy and data integrity are the crucial factors related to authentication of the customer. An authentication mechanism consists of three most prior requirements.
1.memorability
2.secuirty
3.usability

Memorability
This requirement plays a vital role in authentication. A user must memorize the authenticated token given as it directly affects the security of the system as well as the customer.

Security A bank may face a number of problems of security in the authentication process different attacks are defined inn the security, Cameras are put in the ATM room to view any security threats.

Usability In ATM authentication some basic and critical errors are distinguished. Basic errors defined here that one or two times the wrong authentication attempts, and the crucial error is the third attempt by the customer, which is also wrong. ATM’s usually block the bankcard as a safety protocol. When three times with the wrong authentication has been typed into the machine?

Reference: www.bloomberg.com www.banktech.com

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