Based on the expanded requirements, the system architecture is refined to incorporate advanced user management features. This includes designing a user interface for administrators to create and manage user accounts and permissions.
Additionally, the design phase encompasses the integration of intelligent data validation functionalities to ensure data accuracy and integrity during the upload process.

The development team proceeds with implementing the enhanced user management features, leveraging Laravel's authentication and authorization functionalities.
Specific user roles and permissions, including read-only access and upload permissions, are implemented and integrated into the dashboard interface.
Intelligent data validation mechanisms are developed using backend logic to thoroughly scan and validate data upon upload, with detailed error messaging for administrators.

Rigorous testing is conducted to validate the functionality of the added user management features and intelligent data validation mechanisms.
Test cases are designed to verify user account creation, permission assignment, and data validation processes, ensuring robustness and reliability.
User acceptance testing includes scenarios where administrators upload files with intentional errors to verify the effectiveness of the error handling and correction guidance.

Following successful testing, the enhanced dashboard system is deployed to a production environment, ready for use by SUPCO and its administrators.
Deployment procedures include configuring user roles and permissions, setting up secure access controls, and ensuring data encryption protocols are in place to protect sensitive information.

Post-deployment, ongoing maintenance activities include monitoring user activity, addressing any reported issues or bugs, and implementing updates or enhancements as needed.
Continuous monitoring of data validation processes ensures that the system remains highly intelligent in detecting and resolving data discrepancies.
Regular backups of the system state are maintained, enabling administrators to restore previous data versions if necessary, further enhancing data integrity and security.