Occupational Health and Safety Assessment Specification (OHSAS) is an international standard enabling organizations to manage both their operational risks and improve their performance. The technical specification of OHSAS 18001 takes a structured approach to occupational health and safety management (OHS). OHSAS 18001 corresponds to the structure of ISO 14001 and is designed to be compatible with ISO 9001. Certification against OHSAS 18001 is aimed at the way a company has control over, and knowledge of, all relevant risks resulting from normal operations and abnormal situations. It aims at reducing and preventing accidents and accident related loss of live, equipment, time and damage to environment.