This standard defines basic terminology and methodology used in achiving safety of machinery. The provisions stated in this standard are intended for the designer. This standard does not deal with damage to domestic animals, property or the environment. For the purposes of ISO 12100-1 and -2, the following terms and definitions apply: machinery/machine, reliability (of a machine), maintainability (of a machine), usability (of a machine), harm, hazard, relevant hazard, significant hazard, hazardous situation, hazard zone/danger zone, risk, residual risk, risk assessment, risk analysis, risk estimation, risk evaluation, adequate risk reduction, protective measure, inherently safe design measure, safeguarding, information for use, intended use of a machine, reasonably foreseeable misuse, safeguard, guard, fixed guard, movable guard, adjustable guard, interlocking guard, interlocking guard with guard locking, interlocking guard with a start function/control guard, protective device, interlocking device/interlock, enabling device, hold-to-run control device, two-hand control device, sensitive protective equipment (SPE), active opto-electronic protective device (AOPD), mechanical restraint device, limiting device, limited movement control device, impeding device, safety function, unexpected start-up/unintended start-up, failure to danger, fault, failure, common cause failures, common mode failures, emergency situation, emergency operation, emergency stop, emission value, comparative emission data.