Six Features

Dawn Keller's picture
Dawn Keller
Generally speaking, I have a problem with authority. I don’t like being told what to do or how to do it. I’m not proud of that. I recall debating with my high school trigonometry teacher regarding...
Jens R. Woinowski's picture
Jens R. Woinowski
As you browse through lean management pages on the Internet, you may have seen reports on companies having little success with lean, or comments about how misunderstanding lean can lead to bad...
Eston Martz's picture
Eston Martz
Last week I attended the American Society for Quality’s World Conference on Quality and Improvement in Nashville, TN. The ASQ conference is a great opportunity to see how quality professionals are...
Steve Daum's picture
Steve Daum
The ability to make predictions has always been rewarded. Statistician Donald J. Wheeler says that “prediction is the essence of business.” With growing bodies of data and good analytical models,...
Donald J. Wheeler's picture
Donald J. Wheeler
Parts per million (ppm) is part of the language of Six Sigma. It pervades the sales pitch and is used in all sorts of computations as a measure of quality. Yet what are the rules of arithmetic and...
Bruno Scibilia's picture
Bruno Scibilia
The Cp and Cpk are well-known capability indices commonly used to ensure that a process spread is as small as possible compared to the tolerance interval (Cp), or that it stays well within...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
Let’s begin with yet another example of a lack of understanding of the Perversity Principle, this one from a recent The Times of India report. “Authorities in India have reportedly arrested some...
Bob Emiliani's picture
Bob Emiliani
Regular readers of my column, as well as my Twitter and LinkedIn feeds, will know that in recent months I have posted many critiques on various aspects related to the products,...
Michelle Shemo's picture
Michelle Shemo
As a member of Minitab’s technical support team, I get the opportunity to work with many people using design of experiments (DOE). People often will call after they’ve already chosen their...
Bruno Scibilia's picture
Bruno Scibilia
Suppose you have designed a brand-new product with many improved features that well help create a much better customer experience. Now you must ensure that it’s manufactured according to the best...
Patrick Runkel's picture
Patrick Runkel
Right now I’m enjoying my daily dose of morning joe. As the steam rises off the cup, the dark, rich liquid triggers a powerful enzyme cascade that jump-starts my brain and central nervous system,...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
Last weekend we took all 16 members of our family on a ski trip. It was amazing, and we are incredibly lucky. We haven’t done such a thing in 17 years, when our first grandchild, Claire,...
Davis Balestracci's picture
Davis Balestracci
In my last column, I discussed how even a well-designed study with a statistically significant result doesn’t necessarily mean viability in the real world. Post-study, one must study the...
Joel Smith's picture
Joel Smith
I typically attend a few lean Six Sigma conferences each year, and at each there’s at least one session about compensating belts. There are any number of ideas for how to do so, but they commonly...
Quality Transformation With David Schwinn's picture
Quality Transformation With David Schwinn
‘From laughing tots in Haitian preschools to inner-city gang members to top executives in global corporations, people everywhere are gathering in circles. These circles are generating trusting...
Davis Balestracci's picture
Davis Balestracci
I have evolved to using fewer, simpler tools in my consulting and have never been more effective, as I commented upon in my last column. It made me ponder the relevance of much of what I learned in...
Anonymous's picture
Stephen V. Thomas
The purpose of this article is to point out a problem when using percentages for subgroups over time, or for members in a larger group, where the size of the denominator varies and probabilities...
Patrick Runkel's picture
Patrick Runkel
If you’re not a statistician, looking through statistical output can sometimes make you feel a like you’ve wandered into Alice in Wonderland. Suddenly, you find yourself in a fantastical world...
Donald J. Wheeler's picture
Donald J. Wheeler
Whenever the original data pile up against a barrier or a boundary value, the histogram tends to be skewed and non-normal in shape. Last month in part one we found that this doesn’t appreciably...
Thomas R. Cutler's picture
Thomas R. Cutler
This is the last in a series about how lean manufacturing has affected the people and the companywide culture at Hytrol Conveyors, a designer and manufacturer of advanced conveyor systems. As...