Category Archives: Six Sigma

Specifications, Target Values and Loss Function

One of the overall learning objectives for each of our Six Sigma programs is to teach students how to think differently and to do things differently when solving problems and improving processes.  A good example is the use of target values rather than specifications to define the output requirements of a process. When a specification […]

Measuring Process Performance – Average and Variation

Process performance is universally described in practice by collecting data and calculating the mean (i.e. the mathematical average) performance.  Unfortunately, the variation around the mean is almost never included when describing process performance.  This is a critical oversight that is addressed by the Six Sigma methodology. Let me illustrate with an example that I often […]

What Six Sigma is Not

Most introductory courses in Six Sigma talk a lot about what Six Sigma is.  In our Green Belt course I also include a discussion about what Six Sigma is not.  I feel that this discussion is equally important when one is trying to understand the Six Sigma approach to problem solving and continuous improvement. The […]

Selecting a Six Sigma Training Program

I am often asked how one should go about selecting a Six Sigma training provider and training program.  Because there is no universal standard for Six Sigma certification, you should ask the following questions about any certification program that you are considering whether it is delivered online, in a classroom setting, or at the company where […]

Process Capability and Process Control – how are they different?

In our Green Belt course I introduce the concepts of process capability and process control.   I find that many students have trouble understanding the difference between the two.  This is compounded by the fact that the output of a process may fall into of four possible combinations of capability and control. Process capability looks at […]