Why don Xfmea and RCM++ record a separate Detection rating for each Control?
There is no benefit to calculating a separate RPN for each Control, since there is no need to prioritize Controls for corrective action. If there are multiple Controls in place for a single Cause then even if each Control is rated separately, there must be some way to select a single Detection rating that will be used to calculate the RPN for the Cause, which is the actionable level of the analysis. Some analysts may choose to rate each Control and select the lowest rating but many will choose to take all Controls into account and assign a single overall rating. See Technical Support document # RS40007 for a detailed explanation of the approach taken in Xfmea and RCM++.
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- Why don Xfmea and RCM++ record a separate Detection rating for each Control?
