The commissioning process does not change legal relationships. However, it does provide a rigorous process for carefully evaluating legally imposed risks and responsibilities and writing specifications and contracts that accurately reflect the intended risk allocation. In the context of commissioning building systems, reviews the legal aspects of the interrelationship between specifications, inspection, and warranty service, as well as issues concerning sole-source procurement of systems and maintenance services, job-site safety, and design-build approaches.KEYWORDS: commissioning, buildings, calculating, risk assessment, specifications, inspecting, safety, guarantees, law, maintenance