quality management and quality assurance standards; this applies to management and not to product certification, quality system requirements QS-9000 is for the development of fundamental quality systems that provide for continuous improvement, emphasizing defect prevention and the reduction of variation and waste in the (automotive) supply chain, environmental management systems; international standards that specify requirements for an environmental management system, to enable an organization to formulate a policy and objectives taking into account legislative requirements and information about significant environmental impacts; it does not itself state specific environmental performance criteria