In either case, the bank may choose to cover overdrawn items at their discretion and charge an overdraft fee, the amount of which may or may not be disclosed. As opposed to traditional ad hoc coverage, this decision to pay or not pay overdrawn items is automated and based on objective criteria such as the customer's average balance, the overdraft history of the account, the number of accounts the customer holds with the bank, and the length of time those accounts have been open. However, the bank does not promise to pay the overdraft even if the automated criteria are met.