Students in our Green Belt course analyze and comment on a case study that deals with products that are returned by customers. They are challenged to discuss what was done well in the case and what could have been done better. The products being returned for credit are data storage systems that are suspected of […]
One of the first tasks our Black Belt students are asked to do when completing a project is collect data over time and create control charts for the primary output metric. The purpose of these control charts is to establish baseline performance, and to determine if the process is stable. One of my students is […]
Six Sigma is a process improvement methodology that uses facts and data to make decisions, not hunches and opinions. It is obviously important that we use facts and data that are accurate and reliable. The more important the decision and the more serious the consequences, the more care we need to take when collecting data. […]
In an earlier article in this series I discussed the use of sample data drawn from a larger population for the purposes of making decisions. The data in the sample must be representative of the larger population in order for it to be useful in decision making. Consider the stock market in general. What is […]