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

Taguchi Methods for Robust Design and the P-Diagram

In previous articles in this series I introduced Designed Experiments (Article 28) and Taguchi Methods (Article 32).   In this article I will introduce the Parameter Diagram, aka P-diagram, and explain how the P-diagram is used in conjunction with Designed Experiments as part of the robust design process. The P-diagram is used to classify all of […] read more

On December 15th, 2017, posted in: Articles, Six Sigma by Tags: , , ,