Which is a correct description of hazard probability levels in RM?

• A. Frequent or Almost Certain, Likely, Occasional, Seldom, and Unlikely.
• B. Frequent, Likely, Possible, Unlikely, and Impossible.
• C. Certain, Probable, Possible, Rare, and Never.
• D. Constant, Regular, Irregular, Sporadic, and Null.

Answer: (A)

Hazard probability levels describe how often a hazard may occur during a mission. In risk management, you assess both how severe the harm could be and how likely it is to happen, using a five-level scale that runs from most frequent to least: Frequent or Almost Certain, Likely, Occasional, Seldom, and Unlikely. This phrasing provides a clear and practical continuum for judging how often a hazard might occur in typical operations, without resorting to absolutes. The option that lists these exact categories matches the standard RM approach, making it the best description of hazard probability levels. Other sets use terms like Impossible, Never, Constant, or Regular, which aren’t part of the conventional five-level probability scale used in hazard assessment.