Automated testing is the execution of a human's test. It must include the obvious parameters that define components and thermal and fluid exchanges expected in design. Nodes of protection, assure equipment can recover from a fault, require real external actions to be detected not simulated within the BAS. Load response can be digitally simulated and evaluated to preset acceptance criteria. Commissioning one device with human flexibility a repetitive system is continually reviewed by occupants for comfort. Discontinuities created by energy saving modes require real events to confirm operation within the limits of the physical world.