This document provides an overview of accounting information systems and ERP systems like SAP Business One. It defines what an information system and defines common categories like transaction processing, management information, and decision support systems. It describes the evolution of information systems from manual to database models. It then focuses on describing Enterprise Resource Planning (ERP) systems, what they are, advantages, and how SAP Business One provides key functionality for accounting, sales, purchasing, inventory and more through its integrated software modules.