This is a practical working guide to the commissioning of BEMS (Building and Energy Management Systems) intended to complement the standard specification for BEMS (AH A/90). The need for this publication has arisen because nothing was available and thorough commissioning of a BEMS is vital for it to perform to specification and maximize energy efficiency. The Code of Practice states the need to maximize the off-site checking of BEMS components (software, graphics and control panels) prior to installation. Pre-commissioning checks cover wiring, sensors, actuators and communications. The section on commissioning looks at interlocks, tuning of control loops and alarms. Specific plant examples are given and witnessing and completion tests are covered. The need for good documentation and the use of checklists is stressed, with several sample checklists in the appendices.