This is an alternate set of rating guidelines. Customized guidelines should be developed for your industry and company.
This summary of alternate ranking criteria can also be used as a guideline for developing your own standardized set of values. In the table, P refers to the Probability of an event. For example, for a rank of 6 in Occurrence, the probability of the cause and the failure mode happening is approximately 1 in 80.
At a level of 6 in Severity (of the failure mode’s effect), there would be some customer dissatisfaction, starting to approach a high level with some interoperability of the part. For a rank of 6 in Detectability, the probability of missing the failure mode would be somewhere around 1 in 100. These probability values might be appropriate for some industries but not for others.