Functional Specification for a Simple Automatic Teller Machine (ATM)
Client: Bank of
Developer: CyberSystems.com
Author: Keith Richards
Introduction
The Simple ATM allows account holders to make deposits to and withdraw funds from any accounts held at any branch of the Bank of Antarctica.
Business Context
Account Holder: a person or organization that creates one or more accounts. Only the account holder is authorized to deposit or withdraw money from these accounts. Only the account holder is authorized to close these accounts.
Account: A record of an amount of money owned by the account's holder, but held by the bank.
Functional Requirements
The Simple ATM only requires two use cases:
UC1: Withdraw
Actors: Account holder and bank
Description: Enables account holder
to withdraw funds from an account held at a bank
Priority: high
Risk: medium
Scenarios:
Main Scenario: Success
AccountHolder: inserts card
ATM: asks for PIN
AccountHolder: enters PIN
ATM: asks for source account
AccountHolder: specifies source account
ATM: asks for amount to be withdrawn
AccountHolder: specifies amount
ATM: requests account to be debited
Bank: debits account
ATM: dispenses cash
Alternate Scenario 1: Insufficient
funds in account
Alternate Scenario 2: Insufficient funds in dispense
UC2: Deposit
Actors: Account holder and bank
Description: Enables account holder
to withdraw funds from an account held at a bank
Priority: high
Risk: medium
Scenarios:
Main Scenario: Success
AccountHolder: inserts card
ATM: asks for PIN
AccountHolder: enters PIN
ATM: asks for destination account
AccountHolder: specifies destination account
ATM: asks for amount to be deposited
AccountHolder: specifies amount
ATM: asks for deposit envelope
AccountHolder: places deposit envelope in slot
ATM: requests account to be credited
Bank: credits account
Supplementary Requirements
Non-Functional Requirements
Usability
Reliability
Performance
Supportability
Implementation
Interfaces
Operation
Packaging
Who installs the system?
How many installations are there?
Legal
Revision History
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Revision |
Revised by |
Date |
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1.0 |
Richards |
7/30/2009 |
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1.1 |
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8/8/2009 |
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