Developed comprehensive user management and data schema documentation for the 03albert09/IWO repository, focusing on clarifying system interactions and administrative workflows. Leveraged Markdown and PlantUML to create detailed use-case diagrams, scenario descriptions, and step-by-step guides that define how users, data schemas, and external systems interact with the application. Applied documentation best practices, requirements engineering, and system design skills to establish a clear foundation for API integration and governance. This work enhanced maintainability and onboarding by providing precise technical references, enabling faster future feature development and supporting cross-team collaboration without introducing new bugs during the documented period of contribution.