The RPN or Risk Priority Number is used to rank the various Failure Modes as to their impact on the output of the subject process.

The Risk Priority Number (RPN) is a key output of a Failure Modes and Effects Analysis (FMEA). It is a calculated metric used to quantify and rank the risk associated with each identified potential failure mode. The RPN is determined by multiplying the scores for Severity (the impact of the failure), Occurrence (the frequency of the failure), and Detection (the likelihood of detecting the failure before it reaches the customer). By ranking failure modes from the highest RPN to the lowest, teams can prioritize their resources and focus mitigation efforts on the most critical risks affecting the process output.

B. False: This is incorrect. The statement accurately describes the fundamental purpose of the RPN, which is to provide a systematic method for ranking failure modes to prioritize corrective actions.

1. Stamatis, D. H. (2003). Failure Mode and Effect Analysis: FMEA from Theory to Execution. ASQ Quality Press. In Chapter 4, "The FMEA Form," the RPN is defined as "a mathematical product of the numerical ratings of the severity, occurrence, and detection" (p. 83). The text further explains that its purpose is to "rank-order the concerns in the process" (p. 84).

2. Purdue University, School of Industrial Engineering. (n.d.). Failure Modes and Effects Analysis (FMEA). Course materials. Retrieved from https://engineering.purdue.edu/~xe/courses/ie336/FMEAhandout.pdf. On page 1, the document states, "The Risk Priority Number (RPN) is the product of the SEV, OCC and DET scores... The RPN is used to prioritize the failure modes for corrective action."

3. Liu, H. C., Liu, L., & Liu, N. (2013). Risk evaluation approaches in failure mode and effects analysis: A literature review. Expert Systems with Applications, 40(2), 828-838. https://doi.org/10.1016/j.eswa.2012.08.010. In Section 2.1, "Traditional FMEA," the paper states, "The risk of a failure mode is evaluated by the risk priority number (RPN)... The RPN value for each failure mode is used to rank the risks in a descending order."