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A quality-oriented process to accomplish the Commissioning (Cx) aim.

Initial CxP has hierarchically two Stages, five Phases and nine Steps as follows. The detailed explanations on those phases and steps are written in this list 'GLOSSARY EXPLANATION'. Simple explanations on the other types of CxP such as Retro-Cx and Re-Cx are written in here, and the details will be defined elsewhere. - Initial Commissioning Process - Production Stage 1) Pre-Design Phase a) Program Step b) Planning Step 2) Design Phase a) Preliminary Design Step b) Working Design Step 3) Elaboration Phase a) Elaboration Step 4) Construction Phase a) Construction Step b) Acceptance Step Operation & Maintenance Stage 5) Occupancy & Operation Phase a) Post-Acceptance Step b) Ordinary Operation Step - Four Types of Commissioning Process - 1) Initial Commissioning (I-Cx): mentioned in the definition of I-Cx 2) Retro-Commissioning (Retro-Cx): First time Cx implemented in an existing building in which a documented Cx was not implemented before. In many cases, Design Documents of the existing building have been lost or unmatched with the current situation. Therefore, the Retro-Cx would include verification process on the design such as shown in parts of the I-Cx. 3) Re-Commissioning (Re-Cx): A Cx implemented after the I-Cx or the Retro-Cx when the owner hopes to verify, improve and document the performance of building systems. Reasons to re-commission a building are diverse. It could be a modification in the user requirements, the discovery of underperformance of the systems, the wish to fix faults found duringthe I-Cx, etc. Periodic Re-Cx ensures that the original performance persists. The Re-Cx is the event that reapplies theoriginal Cx in order to keep the building systems performance. 4) On-Going Commissioning (On-Going Cx): A Cx conducted continually for the purposes of maintaining, improving andoptimizing the performance of building systems after the I-Cx or the Retro-Cx. The large difference between On-Going Cxand periodic Re-Cx is that the Re-Cx refers to the original building systems performance, but the On-Going Cx lays emphasis on the performance optimization. The On-Going Cx is a successive CxP during Operation & Maintenance Stage to resolve operational problems, improve comfort, optimize energy use, and recommend retrofits if necessary.