OHSAS 18001 Occupational Health & Safety Management System was intentionally developed to be compatible with the ISO 9001 (Quality) and ISO 14001 (Environmental) management systems standards for easier integration of quality, environmental and occupational health & safety management systems by organizations. OHSAS 18001 outlines requirements for an occupational health and safety (OH&S) management system, to enable an organization to control its OH&S risks and improve its performance. Like ISO 14001, it does NOT state performance criteria or dictate the design of a management system.