This module provides a comprehensive overview of building control systems and their role in HVAC and building system operation. Participants are introduced to fundamental control concepts, including control loops, inputs and outputs, sensors, actuators, and transducers. The course reviews basic control types such as electric, pneumatic, electronic, and direct digital control (DDC), along with common control strategies including proportional, PI, and PID control. Emphasis is placed on understanding control terminology, identifying control components in the field, and recognizing how proper control design and installation affect system performance during commissioning.