How many phases are defined in the commissioning process?

How many phases are defined in the commissioning process?

• A. Four
• B. Six
• C. Seven
• D. Five

Answer: (D)

Five phases are defined because commissioning covers the project from planning to long-term operation, not just a one-time set of tests. It starts by clarifying what success looks like—defining owner requirements and the basis of design—and then ensures the design truly supports those goals. Next, it moves through construction, aligning installed systems with the requirements and preparing for testing. The actual commissioning phase then verifies performance, makes necessary adjustments, and documents results. Finally, occupancy and operations bring the project into real use, including training, handover, post-occupancy verification, and ongoing optimization. This five-phase structure keeps the process organized across the full lifecycle, ensuring needs are met and performance is sustained.

Five phases are defined because commissioning covers the project from planning to long-term operation, not just a one-time set of tests. It starts by clarifying what success looks like—defining owner requirements and the basis of design—and then ensures the design truly supports those goals. Next, it moves through construction, aligning installed systems with the requirements and preparing for testing. The actual commissioning phase then verifies performance, makes necessary adjustments, and documents results. Finally, occupancy and operations bring the project into real use, including training, handover, post-occupancy verification, and ongoing optimization. This five-phase structure keeps the process organized across the full lifecycle, ensuring needs are met and performance is sustained.