This document provides a guide to implementing an occupational health and safety (OH&S) management system based on BS OHSAS 18001. It begins with an introduction to OHSAS 18001 and the benefits of certification. It then discusses the key elements and requirements of an OH&S management system, including planning, implementation, checking, and management review. The document provides guidance on each process with examples and interpretations to help organizations effectively establish and maintain an OH&S system.