The document provides instructions for drawing a context diagram and level-0 diagram for a service management system. The context diagram should show external entities of customers, drivers, and couriers. Processes include customer requests service, driver/courier accepts service, payment processing, and feedback submission. Data stores are customer data, driver/courier data, payment data, and feedback data. The level-0 diagram also includes customers, drivers, and couriers as external entities and processes of service management, payment processing, and feedback submission using customer data, driver/courier data, payment data, and feedback data data stores, with trust boundaries around customer and employee data stores containing sensitive information.