ASHRAE Guideline 0 “The Commissioning Process” is widely recognized as the best guide for the commissioning of new construction projects. The latest edition, Guideline 0-2013, provides a comprehensive description and step-by-step guide for how formal commissioning should be performed. This guideline is generic in that it does not differentiate between the types of facilities being constructed, and is equally applicable to data centers as to commercial office buildings and other types of facilities. Basically, commissioning is a quality assurance process based on formal, third-party verification and validation.