This module provides an overview of the Testing, Adjusting, and Balancing (TAB) process as it relates to commissioning and Retro‑Commissioning projects. Participants will learn how to prepare for TAB activities, verify TAB plans and procedures, and observe TAB fieldwork to ensure compliance with project requirements and NEBB standards. The course also addresses common TAB issues, verification of air and hydronic system measurements, and the role of TAB in system optimization, building pressurization, and performance improvement during Retro‑Commissioning.