Which type of testing is most associated with verifying system performance in commissioning?

Field testing and verification are crucial components in the commissioning process, as they directly assess the performance of systems in real-world conditions. This type of testing involves hands-on evaluation of equipment and systems to ensure they operate according to the design specifications and meet performance criteria established during the design phase.

During field testing, technicians measure and observe various parameters such as airflow, temperature, pressures, and energy consumption to confirm that systems are functioning as intended. This process helps identify any discrepancies or issues that may need to be addressed before the system is considered fully operational.

In contrast, quality assurance testing typically focuses on overall standards and processes rather than specific performance evaluations of systems. Architectural design reviews assess the design's compliance with codes and project requirements but do not evaluate the actual performance of installed systems. Cost management assessments look at financial aspects and budgeting rather than testing physical systems. Thus, field testing and verification stand out as the most critical for confirming that a system performs effectively during the commissioning phase.