How should an ECO be validated after implementation to ensure it meets requirements?

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When validating an ECO after implementation, the aim is to confirm that the change actually delivers the intended requirements in real usage across the system. End-to-end testing across all affected modules checks the complete process flow, data interactions, and user interactions with the new configuration, verifying that the integrated pieces work together and that the overall outcome meets the specified needs. Following that, targeted regression tests focus on areas that could be impacted by the change, ensuring that existing functionality remains intact and that no unintended side effects were introduced. This combination gives confidence that the ECO is effective in practice and safe for ongoing operation, whereas deploying without testing or relying only on approvals can miss critical issues and hidden impacts.