ABSTRACT
When spreadsheets25 are used to construct an operating characteristic (OC) curve and to find the average outgoing quality limit (AOQL), there is little need for shortcut methods. Two quick and easies for OC and AOQ estimates have been developed as an application of the Poisson table PT-1. These nomographs can be used when computer time is not available or when the expense is not justified. With just a little practice, OC and AOQL curves can be drawn with quick and easy precision. Data developed using the approximator gives three accurate points for each curve. More important, the approximator pinpoints the AQL, the LTPD, and the Pa × p', which is the AOQL. When the expected value (np') which corresponds to P(a) = 95% (0.95) is divided by the sample size (n), the result is the true fraction defective (p'), known as the AQL.
