Acceptance testing evaluates whether the system meets user requirements and performs as expected in real-world conditions. In this case, employees need the graphical interface to work properly for customer data entry. Acceptance testing confirms usability, accuracy, and functionality from the end user’s perspective.

Load testing measures performance under stress, regression testing checks for errors introduced by new changes, and security testing ensures system defenses. These are valuable, but they do not validate end-user satisfaction and workflow alignment.

Acceptance testing is the final validation step before production deployment. It ensures that updates deliver intended business value and user experience. By involving employees in acceptance testing, organizations ensure successful adoption of new systems.