C4A – Better Alternatives to AQL Sampling Plans for Risk Management in Incoming QC

May 28, 2020 @ 10:00 am – 11:30 am


By John N. Zorich


The pros and cons of the 2 most widely used sampling plans (ANSI Z1.4, and Squeglia’s C=0) are examined in detail, focusing especially on the weaknesses of such plans in regards to meeting regulatory requirements. 

Real-world examples are provided for how using such sampling plans leads to production of non-conforming product. 

The advantages of “confidence/reliability” calculations are explained. Such calculations are demonstrated for Attribute data (pass/fail, yes/no data) as well as for variables data (i.e., measurements). If variables data is “Normally distributed” the calculations are extremely simple. The webinar explains how to handle “non-Normal” data, and provides the methods, formulas, and tools to handle non-normality.

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