ATM System Use Cases

Use Case ID:

UC-1

Use Case Name:

User Validation

Actors:

User, ATM System, Bank

Description:

This use case depicts the process of user or card validation when a user accesses an ATM system for performing transactions. In this use case a User visits the ATM system and inserts the card into ATM then the user is requested to input PIN. After entering PIN, the ATM checks for validity of the PIN and if it is entered correctly then Menu options screen is displayed through which a user can perform the required transactions. In case the PIN or Card is invalid then the ATM system returns card and rejects the transaction by displaying message on the screen.

Preconditions:

1. ATM is in operation mode

2. User has inserted card into the system

Postconditions:

1. User has inserted valid card into the system

2. User has entered valid PIN in the system

Priority:

High

Frequency of Use:

Regular

Normal Course of Events:

· Card is inserted by user into ATM

· ATM validates the card

· ATM requests for PIN from user

· User enters PIN into ATM

· ATM checks for validation of PIN

· Correct PIN displays Menu Options Screen

Alternative Courses:

· Card inserted by user is not valid

· Invalid PIN entered into the system

Exceptions:

ATM is unable to recognize inserted card

Includes:

ATM system takes conformation from bank database and confirms validation of card and PIN

Special Requirements:

Invalid PIN is entered no more than 3 times

Assumptions:

User must have a valid card and valid PIN

Notes and Issues:

User inserts invalid or expired card and wrong PIN is entered more than 3 times leads to blocking of card

Use Case ID:

UC-2

Use Case Name:

Withdraw Cash

Actors:

User, ATM System, Bank

Description:

This use case depicts the process of cash withdrawal that is being followed by the user and system when a user accesses an ATM system for withdrawing cash. In this use case a User visits the ATM system and inserts the card into ATM then the user is requested to input PIN. After entering PIN, the ATM checks for validity of the PIN and if it is entered correctly then Menu options screen is displayed through which a user can select option for cash withdrawal. Then the ATM system requests for amount to be dispensed from the user account. The system then checks for User account balance and ATM cash. If both are valid then cash is dispensed and user account is debited. In case the amount requested is not in the ATM or user account balance then the transaction is rejected and the user is informed about the reason on display screen.

Preconditions:

1. User account balance has the requested amount

2. ATM has sufficient funds as per the requested amount by user

Postconditions:

1. The user has received the requested amount

2. Amount is debited from account balance of the user

Priority:

High

Frequency of Use:

Regular

Normal Course of Events:

· User inserts card into ATM

· User enters PIN and ATM validates card

· ATM displays Menu Screen

· User selects option for cash withdrawal

· ATM requests to input amount from user

· User enters amount for withdrawal

· ATM dispenses cash and connects to bank database

· Bank database updates user account balance

· ATM generates receipt

· User receives cash and receipt with notification

Alternative Courses:

· Requested withdrawal amount is not available in ATM

· Requested withdrawal amount is not available in User account balance

Exceptions:

ATM is unable to dispense the requested cash amount but user account is debited

Includes:

Requested withdrawal amount is checked in user account balance as well as ATM before notification to user

Special Requirements:

Checking availability of funds in user account as well as ATM

Assumptions:

There is sufficient funds in the user bank account and ATM

Notes and Issues:

Cash is not dispensed from the ATM but user bank account is debited with the requested amount for withdrawal

Use Case ID:

UC-3

Use Case Name:

Deposit Cash

Actors:

User, ATM System, Bank

Description:

This use case depicts the process of cash deposit that is being followed during interaction between the user and system when a user accesses an ATM system for depositing cash. In this use case a User visits the ATM system and inserts the card into ATM then the user is requested to input PIN. After entering PIN, the ATM checks for validity of the PIN and if it is entered correctly then Menu options screen is displayed through which a user can select option for cash deposit. Then the ATM system requests for amount to be deposited to the user account. The system then checks for validity of user account and requests to input amount to be deposited. If both are valid then ATM requests to insert cash and then ATM updates bank database with input amount. The deposited amount is then confirmed by the bank database and confirmation is sent to ATM system. The ATM then displays amount is credited and the updated account balance. The user receives notification about amount credited into bank account. In case the user account is not valid or the cash deposited is not equivalent to the input amount then the transaction is rejected and the user is informed about the reason on display screen.

Preconditions:

1. User card is valid and associated with valid bank account

2. ATM is operational to accept cash and deposit the amount in user account

Postconditions:

1. User bank account is updated with deposited amount

2. Receipt is generated against the deposited amount

Priority:

Medium

Frequency of Use:

Sometimes

Normal Course of Events:

· User inserts card into ATM

· User enters PIN and ATM validates card

· ATM displays Menu Screen

· User selects option for cash deposit

· ATM requests to input amount from user

· User enters amount for deposit

· ATM requests cash

· User inserts cash

· ATM validates amount and updates bank database

· User account in credited with deposited amount

· ATM generates receipt

· User receives notification

Alternative Courses:

· User account is not valid

· Cash deposited is not equivalent to input amount

Exceptions:

ATM is unable to receive cash

Includes:

Requested deposit amount is checked in user account balance as well as ATM before notification to user

Special Requirements:

Proper denomination of notes and valid amount is inserted into the ATM

Assumptions:

Valid notes and exact amount is inserted into the ATM

Notes and Issues:

Amount inserted is accepted by the ATM but user account balance is not updated