Category Archives: Six Sigma

Quality Pioneers – The Evolution of Six Sigma – First in a Series

One of the first assignments in our Black Belt course deals with the origins of the continuous improvement approach that we know today as Six Sigma.  Many students are surprised to learn that the body of knowledge and the tools and techniques have been evolving for well over 100 years. This article is the first […]

You can’t judge a book by its cover

In our Green Belt program we have an exercise where students create a histogram from a set of data.  Most students use Excel to create their histogram, and here is the resulting graph: When submitting their work, students quite often include a statement to the effect that the data is “normally distributed” because it appears […]

Six Sigma training – online or classroom?

One of the dilemmas that students face when choosing Six Sigma certification training is whether to attend a live, instructor led course in a traditional classroom setting or an online course.  Both types of delivery have pluses and minuses. In the classroom, you will have the benefit of interaction with your instructor and the other […]

Multiple Intelligences and Six Sigma Training

I am often asked to provide recommendations on how to develop and/or select Six Sigma training programs.  An interesting and very useful theory of how people develop and learn is the theory of Multiple Intelligences, developed by Howard Gardner, PhD, Professor of Education at Harvard University. This theory explains that each of us has a […]

Lies and Statistics……

One of my Black Belt students recently submitted his final project report.  He used the two proportions test in Minitab to compare the proportion of on time performance for completion of employee appraisals, before and after improvement.  I sent him the following feedback regarding this test. “Hi.  Your null and alternate hypotheses are correctly stated.  […]

The Central Limit Theorem

Although the central limit theorem can seem abstract and devoid of any practical application, this theorem is actually quite important to the practice of statistics.  As we will see, this theorem allows us to make some assumptions about a population. In order to understand the basis for the Central Limit Theorem, consider a population of […]

Waste and Contributors to Waste

We should constantly strive to provide exactly what the customer wants when working on process improvement.  One way to do so is to identify activities that are wasteful and then work to reduce or eliminate those activities.  Waste is defined as an activity that consumes resources but does not add any value for the customer.   […]