Occupational Health and Safety Assessment Series 18001 (OHSAS 18001) was an international standard for occupational health and safety management systems. It was developed in March 1999 by Occupational Health and Safety Assessment Series Project Group, by a national standards bodies, academic bodies, accreditation bodies, certification bodies and occupational health and safety institutions,[1] with the UK’s national standards body, BSI, providing the secretariat.[2] The goal of the standard is the reduction of occupational injuries and diseases, including promoting and protecting physical and mental health. The standard was designed to fit into an integrated management system. ISO 45001 was published in March 2018 by International Organization for Standardization.[3] The Occupational Health and Safety Assessment Series Project Group adopted the ISO 45001. Organizations that are certified to OHSAS 18001 were able to migrate to integrated management system or ISO 45001 by March 2021 to retain a valid certification.[4]