Two types of bookkeeping are the single-entry method and the double-entry method. Single-entry bookkeeping lists transactions, like a check register or bank statement, and is typically used with the cash basis of accounting. Double-entry accounting is a system of balanced debits and credits used by most companies under the accrual basis of accounting. Both types of bookkeeping can be done either manually or in a computerized environment. Most companies use computerized accounting systems.