This document provides an overview of the history and evolution of organizational information systems, from early calculation systems used to automate specific tasks to modern integrated enterprise resource planning (ERP) systems. It describes the transition from single-purpose calculation systems to functional departmental systems to integrated ERP systems. The benefits of ERP systems include common data sharing, integrated applications, and process standardization. However, ERP implementations are also very challenging due to high costs, extensive customization requirements, and need for organizational change management.