Measuring and evaluating a WHSMS's performance involves: 1. Monitoring: Regularly monitor and record health and safety performance data. 2. Inspections and Audits: Conduct regular inspections and audits to ensure compliance with the WHSMS. 3. Incident Investigation: Investigate any incidents or near misses to identify causes and prevent future occurrences. 4. Performance Indicators: Use performance indicators, such as injury rates or safety climate scores, to measure performance. 5. Review: Regularly review performance data and make improvements as necessary. Requirements for these processes include a system for recording and analyzing data, trained personnel to conduct inspections and investigations, and a process for reviewing and improving the WHSMS