This International Standard specifies guiding principles for project design and implementation and for the integration of other systems into the building automation and control systems (BACS). This International Standard specifies the phases required for the BACS project, including: - design (determination of project requirements and production of design documents including technical specifications), - engineering (detailed function and hardware design), - installation (installing and commissioning of the BACS), and - completion (handover, acceptance and project finalization). This International Standard also specifies the requirements for as-built documentation and training. This International Standard is not applicable to operation and maintenance, nor is it applicable to retro or continuous commissioning, including a commissioning authority.