Think of your personal bank account experience When in doubt, go for the simplest solution

Deposit and Withdrawal Account statement (date, amount, balance) Statement printing

US 1: In order to save money As a bank client I want to make a deposit in my account. US 2: In order to retrieve some or all of my savings As a bank client I want to make a withdrawal from my account. US 3: In order to check my operations As a bank client I want to see the history (operation, date, amount, balance) of my operations.

Started from defining an acceptance test:

Given a client makes a deposit of 1000 on 10-01-2012
And a deposit of 2000 on 13-01-2012
And a withdrawal of 500 on 14-01-2012
When she prints her bank statement
Then she would see
date || credit || debit || balance
14/01/2012 || || 500.00 || 2500.00
13/01/2012 || 2000.00 || || 3000.00
10/01/2012 || 1000.00 || || 1000.00