The responsibilities of an automated lighting programmer are similar to that of an airplane pilot in several ways. We have to control expensive equipment, ensure a successful production (flight), and we must be masters of our crafts. Before beginning a flight, an airplane pilot always checks the airplane from top to bottom, inside and out. In the same manner, it is important for a lighting programmer to confirm "all systems are GO" prior to starting a programming session. With any size lighting rig, there are certain procedures and tests that should be performed before a single cue is written. Failure to accurately test the rig can result in long delays or inaccurate values being recorded.
From "Feeding the Machines" by Brad Schiller, PLSN, July 2010