Accounting information system, which is a sub-system of management information systems, interacts with the other sub-systems within the business in order to accomplish the objectives of the business. Every business has an accounting information system regardless of its size. Basically, accounting information system is the same for all the businesses in the manner of input-process-output flow. The differences are the hardware and software used in the system and the way of doing the transactions. The way of doing the transactions affects the interactions among the departments that participate in fulfilling the process and also the type and the number of the copies of the documents used in the transaction.