An accounting information system (AIS) is a system of collection, storage and processing of financial and accounting data that is used by decision makers. An accounting information system is generally a computer-based method for tracking accounting activity in conjunction with information technology resources. The resulting statistical reports can be used internally by management or externally by other interested parties including investors, creditors and tax authorities. The actual physical devices and systems that allows the AIS to operate and perform its functions1. Internal controls and security measures: what is implemented to safeguard the data2. Model Base ManagementHistoryInitially, accounting information systems were predominantly developed in-house as legacy systems. Such solutions were difficult to develop and expensive to maintain. Today, accounting information systems are more commonly sold as prebuilt software packages from vendors such as Microsoft, Sage Group, SAP and Oracle where it is configured and customized to match the organizations business processes. As the need for connectivity and consolidation between other business systems increased, accounting information systems were merged with larger, more centralized systems known as enterprise resource planning (ERP). Before, with separate applications to manage different business functions, organizations had to develop complex interfaces for the systems to communicate with each other.