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Sampling Plan Analyzer Help System 

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Max OC Curve - Maximum Operating Characteristic Curve





The maximum OC curve is calculated and displayed only when the protection varies. In this case the probability of acceptance is not constant. Instead it depends on other circumstances such as the quality of previous lots produced. For the ANSI Z1.4 plan shown above, the results of inspections of previous lots determines which of three sampling plans to use on the current lot.

The maximum OC curve shows the maximum probability of acceptance across all possible circumstances. For the ANSI Z1.4 plan this means the maximum probability of acceptance of the three plans that might be used. The maximum OC curve is the top of the three OC curves shown above. It along with the
minimum OC curve and stationary OC curve describe the range of protection that can result when the protection varies.