1. The document describes a case study of an ATM system for ViaNet Bank. It identifies the system requirements, actors, and key use cases for depositing and withdrawing money from checking and savings accounts. 2. The main use cases are the bank ATM transaction, approval process, deposit amount, and withdraw amount. Additional use cases extend these for invalid PIN, depositing/withdrawing from specific account types, and withdrawing more than the checking balance from savings. 3. Sequence diagrams and descriptions are provided to illustrate the steps in each use case, including inserting the card, entering the PIN, selecting the transaction type, performing the transaction, and taking the card.

1. CASE STUDY
- Identifying Use case & Actors
Analyzing the Vianet Bank ATM

2. Background
• System’s Requirements
1. The client must be able to deposit and
withdraw amount using ViaNet Bank Atm.
2. The date, time, transaction type, amount,
account balance must be recorded for each
transaction.
3. Two types of accounts are present.
i) Checking Account
II) Saving Account
4. We can Access the ViaNet Bank account
using a PIN code.

3. Contd….
4. Negative balance is not allowed for both
the accounts.
5. If the withdrawal amount is more than
the balance in the checking account then
the system automatically withdraws from
the saving account.
6. If the balance on the saving account is
less than the withdrawal amount then the
transaction will stop.

4. Identifying actors and usecases
The following usecases are created by using
system requirements, examination of existing
systems, interviews and asking questions,
observation.
2. Bank ATM Transaction
The steps in ATM transaction usecase are
 Insert ATM card
 Perform Approval Process
 Ask type of Transaction
 Enter the type of Transaction
 Perform transaction
 Eject card
 Request take card
 Take card

6. Usecase’s Description
2. Approval Process
The Client enter the pin no, if it is valid, client’s
account become active.
The steps are
a) Request Pin no
b) Enter Pin no
c) Verify Pin no
3. Invalid Pin
If the pin no is not valid then appropriate msg is
displayed to client. This extends the approval
process.

7. Contd….
4. Deposit Amount
After the approval process, the client
requests to deposit money to an account.
The steps are
Request Account type
Request Deposit amount
Enter deposit amount
Put the cheque or cash in envelop and insert into
ATM

8. Contd..
5. Deposit Savings
The client selects the saving account type for
deposit, all the steps are same to the previous
one.
It extends the deposit amount Usecase
6. Deposit Checking
The client selects the checking account type for
deposit, all the steps are same to the previous
one.
It extends the deposit amount Usecase

9. Contd…
7. Withdraw Amount
After the approval process, the client
requests to withdraw money from account.
The steps are
Request Account type
Request Withdrawal amount
Enter Withdrawal amount
Verify sufficient funds
Eject cash

10. Contd…
8. Withdraw Checking
• The client tries to withdraw amount from his
checking account.
• When the amount is less than or equal to the
balance the transaction is performed.
• It extends the withdraw money usecase.
9. Withdraw more from Checking
The client tries to withdraw amount from his
checking account.
When the amount is more than the balance the
insufficient amount is withdrawn from the related
savings account.
It extends the withdraw money usecase

11. Insert card
Enter
password
Password rejected
Password accepted
Select type
of
transaction
more transaction
Perform
transaction
No more transaction
Take the
card

12. Bank ATM
<<uses>>. Approval process
Transaction
<<extends>>.
<<extends>>.
Checking
Invalid pin
transaction
history
<<extends>>.
<<extends>>.
<<extends>>.
Saving
Withdraw amount
transaction Deposit amount
history

13. Approval
Bank ATM <<uses>>.
process
Transaction
<<extends>>.
<<extends>>.
Checking
transaction Invalid pin
history
<<extends>>.
<<extends>>.
<<extends>>.
Saving Withdraw
transaction Deposit amount
history amount
<<extends>>.
<<extends>>.
<<extends>>.
Deposit checking
withdraw checking
Withdraw more
<<uses>>.
from checking
Withdraw saving