Which description best defines reasonably likely in this context?

• A. It is a hazard that is reasonably likely to occur, historically has occurred, or there is a reasonable possibility that it will occur
• B. It is guaranteed to happen
• C. It never occurs
• D. It is an unpredictable event

Answer: (A)

In risk assessment, “reasonably likely” means there’s credible evidence or history that the event could happen, not just a vague possibility. The description that fits best says the hazard is reasonably likely to occur, or has occurred in the past, or there is a reasonable chance it could occur based on current conditions. It’s a real possibility supported by data or experience, not a guaranteed outcome, never happening, or something completely unpredictable. For example, if conditions at a site have historically led to a specific failure, that indicates a reasonable likelihood, so it should be considered in planning and controls.