severity and probability

When undertaking a Hazard Analysis the severity and probability must be determined.

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What are the concerns when trying to determine if a severity is either critical or marginal and the probability is either frequent or probable? Selecting the wrong one may result in a major hazard being ignored or a minor one being given priority it does not warrant.

refer to chapter 5 of the text book (System Safety Engineering and Risk Assessment: A Practical Approach) for more info

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