To Transform Data, or Not to Transform, That is the Question!

In a previous article in this series I discussed whether or not to transform data that is non-normally distributed in order to make the data normally distributed.  In that article I stated the following: “Data that follow a distribution that is either not symmetric or that is symmetric but not bell shaped are said to […] read more

On March 17th, 2018, posted in: Project Management by

Rational Subgrouping of Data for Control Charts

Control charts are a tool to evaluate the performance of a process over time.   Think of the process as a river that is flowing past the point where we will collect data.  We must decide what to measure, how to measure, where to measure and how often to collect data from the process.   The story […] read more

On March 6th, 2018, posted in: Articles, Six Sigma by Tags: ,

SWOT Analysis

One of the tools that may be used to define the current state of a process is SWOT analysis.  Our Black Belt students are required to perform a SWOT analysis as part of their Black Belt project. SWOT is an acronym that stands for Strengths, Weaknesses, Opportunities and Threats.  Strengths and weaknesses are internal to […] read more

On February 16th, 2018, posted in: Articles, Six Sigma by Tags: ,

The SIPOC Diagram – A Basic Process Mapping Tool

One of the first steps in any improvement project is to describe the current process using a map of some sort.  One basic mapping tool is the Supplier-Input-Process-Output-Customer diagram, commonly referred to as a SIPOC diagram.  Another commonly used tool is the cross-functional process map. Both of these tools are important first steps in understanding […] read more

On January 15th, 2018, posted in: Project Management by