OHSAS 18001 Occupational Health and Safety stands for Occupational Health and Safety Series.
OHSAS 18001 is a consensus standard developed in 1999 by an independent panel of national standardization and certification (registration). OHSAS 18001 is structured in the same way as the ISO 14001 environmental management system, and is roughly the same elements. It has been specially developed to be compatible with the ISO 9001 quality system and ISO 14001 to allow companies to develop and register integrated quality systems, environmental and occupational health.