TECHNICAL ARTICLES
Articles Published in Quality Digest
The Paradox of Acceptance Sampling - We Keep Trying to Find a Needle in the Haystack
02 October 2018; Article demonstrates the diminishing returns inherent in acceptance sampling and contrasts plans for product control with plans for process control.
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MIL-STD-105 Process Control - 08 October 2018; Article demonstrates MIL-STD-105 (ANSI/ASQ Z1.4) as a process control procedure and provides an accurate historic perspective on the origins of the "acceptable quality level (AQL).
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MIL-STD-105 Using Imaginary Limits - The use of imaginary limits enables us to apply MIL-STD-105 directly without the worries of acceptance numbers greater than zero. The resulting sampling plans have more discriminating power than conventional c=0 sampling plans.
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d2: More Than Just a Control Chart Constant - 07 November 2018
Every Quality Professional should understand the lessons from L.H.C Tippett's 1925 paper on extreme values. This research has broad implications on the Quality profession and our ability to inspect for conformance to requirements.
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Reverse Engineer Your Experiments - 06 December 2018
Start with the answer in mind and don't be surprised during the analysis. For conducting designed experiments or simply for capability studies, let's start with the critical value and work backwards to the required sample size.
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Other Technical Articles
MIL-STD-105 (ANSI/ASQ Z1.4) For Process Control - Part 2
How were the sample sizes of MIL-STD-105 (ANSI/ASQ Z1.4) determined? What value is the Accept and Reject number? What is the linkage to control charting? Download this short story about additive manufacturing to learn more.
Precision of Averages Over Individuals
The relationship between averages and individuals has wide practical usage. We can easily reduce measurement uncertainty by using average values instead of individual observations. However, the relationship is not linear and there are trade-offs between cost and precision. Download this chart to learn more.
Control Charting - The Way Shewhart Intended
There is still a lot of confusion about control charting. Download this article which I published in the Journal of Quality Engineering to learn about the flexibility Walter Shewhart incorporated into his own work.