This lecture focuses on designing, implementing, and integrating Building Automation Systems (BAS), treating BAS projects as both construction and IT projects. It covers design principles, zoning, control hierarchy, interoperability, open standards, procurement, installation, programming, commissioning, and handover. The lecture also explores BAS integration with HVAC, lighting, security, fire alarm, elevators, and metering, highlighting the importance of continuous commissioning for long-term building performance.