In this session, Troy Byers of the AABC Commissioning Group walks through the origins and purpose of the ACG commissioning guideline, tracing its roots back to the Associated Air Balance Council and the evolution of testing, adjusting and balancing (TAB) practices. What began as a way to ensure HVAC systems performed as intended has expanded into a comprehensive approach to commissioning that now spans all major building systems. Buyers explains how the guideline was created to bring clarity and consistency to a growing, increasingly complex discipline.