The Occupational Health and Safety Act in Ontario requires that most workplaces with 20 or more workers have at least one worker and one management person to serve as certified members of a workplace Joint Health and Safety Committee. This certification involves training in health and safety law, and the identification, assessment and control of hazards.

A Joint Health and Safety Committee has at least two members for workplaces regularly employing less than 50 workers, or at least four members for workplaces regularly employing 50 or more workers. At least half the members represent workers.

Some of the duties of the Joint Health and Safety Committee are to identify hazards, conduct monthly workplace inspections, recommend ways to improve and maintain the health and safety of workers, participate in work refusal investigations, and investigate critical injuries.

Certification involves two mandatory parts: Basic Certification (Part 1) and Workplace-Specific Hazard Training (Part 2).