Who supervises or directs the CxT during the Construction Phase?

• A. CxT
• B. CxA
• C. Shared
• D. CxP

Answer: (B)

During the Construction Phase, the Commissioning Authority directs the work of the Commissioning Team. The CxA acts as the owner’s representative for the commissioning process, coordinating activities, approving test procedures, and ensuring that installed systems perform in accordance with the design intent and stated owner requirements. The CxT carries out the field tasks—testing, tuning, and verifying systems—but their activities are guided and overseen by the CxA to keep everything aligned with the commissioning plan and milestones. While the commissioning provider or project management may support logistics and administration, the authority to supervise the CxT in construction rests with the CxA. The idea of shared supervision introduces ambiguity and is not how the supervisory relationship is typically defined in commissioning practice.