This document provides an overview and comparison of two occupational health and safety management systems: OHSAS 18001 and ANSI Z-10. OHSAS 18001 was developed internationally in 1999 to specify requirements for an occupational health and safety management system. ANSI Z-10 is being developed as a US national standard and is expected to be published in 2004. Both standards require organizations to implement health and safety policies and procedures, identify hazards, set objectives, and conduct audits. While there are some differences in structure, the requirements of the two standards are largely compatible.