Abstract: The stock administration program architecture involves user roles, such as managers, administrators, and staff, interacting with the system's components to access and process data. The system's development relies on hardware and application elements, including databases, front-end and back-end systems, code editing tools, and local servers. A use-case approach organizes stock administration, with diagrams showing users' interactions with the system. Administrators can manage stock by adding, modifying, or deleting items, while the system provides reports for analysis and decision-making. Staff members can view inventory, adjust stock levels, and receive alerts for low stock. Managers oversee stock requests, analyze reports, and manage staff accounts. A SUS questionnaire was administered to assess usability, revealing user perceptions based on ease of use, efficiency, and satisfaction. Comparing SUS scores across user roles helps identify usability challenges. High scores indicate that the system is user-friendly and effective, while lower scores suggest areas for improvement through training, redesign, or feature enhancements. Users reported high usability for ease of use, with support requirements scoring second highest. Staff ratings highlighted areas for improvement, such as stock level notifications, which can be addressed through redesign or training to enhance system usability.