During external audits, TS audits had been telling us that everything that we identified with a severity of 9 or 10 should be identified as a critical characteristics.. auditors said that this is due to AIAG rules.. I don't recall anything like that in the AIAG FMEA handbook. The only thing I found on page 57 is that when the severity is 9 or 10, it is imperative that the team must ensure that hte risk is addressed through existing design controls or recommended actions. But it does not say that I should put a "CC", "C", or special symbol on the classification colum.. is there something that I'm missing? Am I right? are the auditors right?