Comprehensive commissioning can be described as which statement?

• A. Commissioning is optional.
• B. Commissioning is completed after occupancy.
• C. Commissioning is performed only during construction.
• D. Commissioning is included during all phases of the design and construction process.

Answer: (D)

Comprehensive commissioning means integrating the commissioning process across every stage of the project—from early planning and design through construction and into occupancy and ongoing operation. The goal is to verify that the building’s systems are designed, installed, tested, and calibrated to meet the Owner’s Project Requirements and performance criteria, and to document how they should operate for reliable, energy-efficient performance after handover. By involving design teams, contractors, facility staff, and the owner throughout all phases, gaps are caught early, design intent is preserved, and the resulting performance is demonstrable with test data and documented procedures.

This is why the statement that it’s included during all phases is the best choice. It reflects the continuous, integrated nature of true commissioning, rather than treating commissioning as optional, ending after occupancy, or limited only to construction.