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I'm looking at ANSI/ASQ Z1.4-2003 (sampling procedures for attributes), and in 9.2 Inspection Level, it says "Three inspection levels: I-III are given for general use. Unless otherwise specified, Level II will be used. Level I may be specified when less discrimination is needed, or III may be specified for greater discrimination."
When is this used? It makes sense to me that you would use one level of general, and then switch between tightened and reduced inspection, but the logic of having levels within General inspection levels is not clear to me. This would change the probability of finding defects but how much?
When is this used? It makes sense to me that you would use one level of general, and then switch between tightened and reduced inspection, but the logic of having levels within General inspection levels is not clear to me. This would change the probability of finding defects but how much?
With computers on every desk, it seems so archaic to have a set of tables as the standard. It would be so easy to generate a plan based on your own criteria! Just pick your parameters (like 95% chance of accepting 1% defects and 95% chance of rejecting 5% defects out of a batch of 12,000 pieces) and let the computer tell you the proper plan.