WTA has a long history in commissioning, even before it became widespread. Our experience in delivering commissioning services is extensive and varied. We have performed commissioning services as an independent consultant as well as commissioning projects for which WTA was the engineer of record. Our commissioning projects have also been initiated during all phases of project development: pre-design, design review, pre-construction, pre-occupancy, and post-occupancy. Participation in the established LEED^TM program is a natural extension of our continuing development of this service offering.