This "IssueTrak" discusses an increasing interest in verifying the installation and performance of building systems prior to delivery and final acceptance by the building owner. This interest in quality assurance has spawned a new and distinct professional construction discipline referred to as building commissioning. The principal objective of commissioning is to define, develop and integrate a formal and fully documented process of review, inspections and testing into the standard project delivery methods. Several states have required a formal commissioning plan be implemented as part of the construction process on all major school district projects, and in some cases, commissioning has become a prerequisite to final project acceptance. The firm and/or individual responsible for developing and managing the commissioning process is referred to as the Commissioning Agent or Commissioning Authority (CA). The scope of services commonly available under the CA's contract can include the following: Pre-Design Phase; Design Phase; Construction Phase; Post-Construction Phase; Warranty Phase. These disciplines have been used in over 200 K-12 projects.