Hazards, risks, outcomes

The terminology used in OSH varies between states, but generally speaking:
• A hazard is something that can cause harm if not controlled.
• The outcome is the harm that results from an uncontrolled hazard.
• A risk is a combination of the probability that a particular outcome will occur and the severity of the harm involved.
“Hazard”, “risk”, and “outcome” are used in other fields to describe e.g. environmental damage, or damage to equipment. However, in the context of OSH, “harm” generally describes the direct or indirect degradation, temporary or permanent, of the physical, mental, or social well-being of workers. For example, repetitively carrying out manual handling of heavy objects is a hazard. The outcome would be a musculoskeletal disorder (MSD). The risk can be expressed numerically, (e.g. a 0.5 or 50/50 chance of the outcome occurring during a year), qualitatively as "high/medium/low", or using a more complicated classification scheme.