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Determining probability or likelihood generally involves: (i) a review of relevant historical data to identify events or situations which have occurred; (ii) predictive‐type techniques such as fault tree analysis and event tree analysis, and; (iii) a structured systematic process guided by a qualified, knowledgeable expert(s). Any available data used should be relevant to the focus of the assessment. Where historical data shows a very low frequency of occurrence, it may be difficult to properly estimate probability. Therefore, it may be necessary to consider exposure frequency, time, and duration to a certain hazard or event in the likelihood analysis.