This document outlines the requirements for developing an online car rental system to replace an existing paper-based system. It includes a business case, functional decomposition diagram, data flow diagrams, process descriptions, and recommendations for menus, forms, and reports. The system will allow the manager to monitor market demand through generated reports and synchronize information across branches for accurate decision making. It will follow a waterfall development approach and include features for input, output, processing, performance, and control.