Commissioning Process Fundamentals and Project Initiation
The process as a whole
The commissioning (Cx) process is a quality-focused, documented method of verifying that building systems perform as the owner intends. Know the standard sequence: initiate the project, define the Owner's Project Requirements (OPR), review the Basis of Design (BOD), incorporate Cx into design and construction documents, conduct construction-phase activities, perform functional performance testing (FPT), complete seasonal testing, deliver training and the systems manual, and issue the final commissioning report. A candidate must be able to place any activity in the correct phase and identify the responsible party for each.
Roles and initiation
Distinguish the Commissioning Authority (CxA) from the contractor, the design team, and the owner. The CxA leads and documents; the contractor installs and self-tests; the designer produces the BOD; the owner approves the OPR. Initiation includes selecting the CxA early, defining scope and systems to be commissioned, and establishing the Cx team and communication structure. Trap: questions often imply the CxA designs or installs fixes - the CxA verifies and documents but does not take design or construction responsibility.
Rule of thumb
The earlier the CxA is engaged, the greater the value; engagement during design is preferred over construction-only. If asked "when should the CxA be hired," the best answer is typically as early as possible, ideally before or during design.
Worked example
A project asks whether the CxA can approve the contractor's equipment substitution. No - the designer evaluates and the owner approves; the CxA verifies the resulting documentation and testing. Use this owner/designer/contractor/CxA split to resolve role questions.