"the basis of recognized statistical principles", gentlemen as a quality manager of a machine shop we state and use ANZI/ASQC Z1.4 level II AQL 4 as a vehicle for accepting received or shipping final parts. The auditor has NCR'd me for not defining the Machine inprocess frequency per ANZI/ASQC. My inprocess inspection reports say 1 out of every 5, in most cases, which ironically exceeds our standard AQL, in others where i know i have heavy tool wear or previous issues i have used 1 out of 3 or even 100%. To clarify, this is in between machining operation not a criteria for final acceptance. Does the auditor have a case?