William A. Levinson
Inflation is a serious national issue. Credit agency Fitch Ratings just downgraded the U.S. credit rating—as in the “full faith and credit of the United States”—from AAA to AA+.1 This doubtlessly...
Donald J. Wheeler
As we learned last month, the precision to tolerance ratio is a trigonometric function multiplied by a scalar constant. This means that it should never be interpreted as a proportion or percentage....
Donald J. Wheeler
The keys to effective process behavior charts are rational sampling and rational subgrouping. As implied by the word rational, we must use our knowledge of the context to collect and organize data in...
Paul Laughlin
Continuing our thinking about ways for data leaders to save money during a recession, this article drills into saving on your data usage. Following my last post reminiscing on the lessons I learned...
Donald J. Wheeler
As the foundations of modern science were being laid, the need for a model for the uncertainty in a measurement became apparent. Here we look at the development of the theory of measurement error and...
Donald J. Wheeler
In memory of Al Phadt, Ph.D.
This article is a reprint of a paper Al and I presented several years ago. It illustrates how the interpretation and visual display of data in their context can...
Alan Metzel
Almost seven years ago, Quality Digest presented a short article by Matthew Barsalou titled “A Worksheet for Ishikawa Diagrams.” At the time, I commented concerning enhancements that provide...
Donald J. Wheeler
The computation for skewness does not fully describe everything that happens as a distribution becomes more skewed. Here we shall use some examples to visualize just what skewness does—and does not—...
William A. Levinson
Corrective action and preventive action (CAPA) is probably the most important process in any quality management system because so much else depends on it. This includes not only its traditional role...
Donald J. Wheeler
The cumulative sum (or Cusum) technique is occasionally offered as an alternative to process behavior charts, even though they have completely different objectives. Process behavior charts...
OpusWorks
Over two days, engage in eight unique best practice sessions with 11 process improvement and thought leaders at S.O.A.R. 2022, OpusWorks’ annual virtual conference.
Designed to present highly...
Harish Jose
In today’s column, I’m looking at the Ohno Circle in light of German philosopher Martin Heidegger’s ideas. I’ll try to stay away from the neologisms used by Heidegger and will only...
Richard Harpster
On Dec. 7, 2021, Ford Motor Co. updated its IATF 16949—“Customer specific requirements” (CSR), which require the use of reverse FMEAs (RFMEA) on new equipment (“tooling”). The first sentence of the...
Donald J. Wheeler
Many different approaches to process improvement are on offer today. An appreciation of the way each approach works is crucial to selecting one that will be effective. Here we look at the problem of...
James J. Kline
Big data is a relatively new phenomenon. Its use is increasing in many organizations. But, as with many new processes, its use cuts both ways. It has positive benefits to both the organization and...
Donald J. Wheeler
Students are told that they need to check their data for normality before doing virtually any data analysis. And today’s software encourages this by automatically providing normal probability plots...
Brittney McIver
At some point, every medical device company will encounter an issue that requires an internal investigation. Whether it’s due to a nonconformance, complaint, CAPA, or an audit issue, you’ll have to...
Anthony Tarantino
In 2007, Nassim Taleb described black swans as highly improbable events that had dramatic or even catastrophic effects on markets and economies. Until recently, it seemed that such events were indeed...
Scott A. Hindle
In 2010, new to the world of statistical process control (SPC), I was intrigued by Don Wheeler’s statement that “No data have meaning apart from their context” (from his book, Understanding...
V R Vijay Anand
As the world moves toward a new, post-pandemic normal, industries must leverage digital transformation at an accelerated pace. This is already happening. According to IBM, 67 percent of manufacturers...
