Which level of testing evaluates the entire system's compliance with specified requirements?

The level of testing that evaluates the entire system's compliance with specified requirements is system testing. This type of testing is critical because it involves validating the complete and integrated software product to ensure it meets the defined requirements and works as intended in the intended environment.

During system testing, QA teams typically execute various test scenarios that cover functional and non-functional requirements, confirming that the system behaves correctly under a variety of conditions. System testing checks aspects such as performance, security, and usability, often involving end-to-end testing of the complete system.

By focusing on compliance with requirements, system testing serves as a bridge between development and release, ensuring that the software is not only built correctly but also meets the expectations set forth in the requirements documentation. This comprehensive approach helps identify any discrepancies or issues that may not have been caught during earlier testing phases, such as unit or integration testing.