Quality Tools

Determining Which Tool or Technique to Use Gets Easier With Experience

Deciding which tool or technique to use is sometimes challenging, but usually becomes less of a problem with experience.  As an MBB I have certain favorite tools and techniques I use more often because I am more familiar with them and am more comfortable using them. I personally like tools that are graphical in nature, tools such as Pareto charts, box plots, run charts, control charts, VSM,...

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Design of Experiments Are The Work Horse of Quality Improvement

The purpose of a design of experiments is to provide the most efficient and economical methods of reaching valid and relevant conclusions from the experiment being conducted.  As stated in previous blog posts, there are many experimental designs to chose from and in my opinion this is part of the problem.  The novice experimenter when faced with so many choices can become confused and...

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Screening Design of Experiments Sort Out Important Factors

As I stated in last week’s post, most beginning experimenters try to combine everything into one experiment.  The thinking is if they can include everything, they can do one experiment and be done.  But it never works that way.  Instead it is an iterative approach, where you learn as you go, getting a better understanding with each experiment conducted. So where and how do you get...

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A Beginners Guide To Design of Experiments

Design of experiments (DOE) is one of the most valuable tools in the Six Sigma toolkit.  It is the only tool that allows a proactive approach for process improvement.  Unlike analysis of variance (ANOVA) or regression where past data is analyzed, DOE allows for the collection of realtime data and its analysis.  It is ideally suited to address problems where more than one variable may affect...

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Use Pareto Charts To Allocate Scarce Resources

Most everyone is familiar with Pareto Charts and how they can be used to help prioritize issues, ideas, and so on.  But in addition to helping you prioritize your actions, you can use them with the addition of a ABC Classification to help you allocate limited resources, and become more focused and efficient in your job. Pareto charts were named after the Italian economist, Vilredo Pareto, who...

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Multi-vari Charts Help Identify Sources of Process Variation

    A multi-vari chart is a useful tool to help you determine the sources of variation in a process.  The chart was first described by Leonard Sedar in 1950.  To develop a chart, the quality characteristic of interest is plotted across three horizontal panels that represent: Variability on a single piece Piece-to-piece variability Time-to-time variability The problem solving...

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