Seven Quality Tools_Spring_2010

# Seven Quality Tools_Spring_2010 - Seven Quality Tools The...

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Seven Quality Tools The Seven Tools Histograms, Pareto Charts, Cause and Effect Diagrams, Run Charts, Scatter Diagrams, Flow Charts, Control Charts

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Ishikawa’s Basic Tools of Quality Kaoru Ishikawa developed seven basic visual tools of quality so that the average person could analyze and interpret data. These tools have been used worldwide by companies, managers of all levels and employees.
Histograms Slide 1 of 3 Histogram Defined A histogram is a bar graph that shows frequency data. Histograms provide the easiest way to evaluate the distribution of data.

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Histograms Slide 2 of 3 Creating a Histogram Collect data and sort it into categories. Then label the data as the independent set or the dependent set. The characteristic you grouped the data by would be the independent variable. The frequency of that set would be the dependent variable. Each mark on either axis should be in equal increments. For each category, find the related frequency and make the horizontal marks to show that frequency.
Histograms Slide 3 of 3 Examples of How Histograms Can Be Used Histograms can be used to determine distribution of sales. Say for instance a company wanted to measure the revenues of other companies and wanted to compare numbers.

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Pareto Charts Slide 1 of 4 Pareto Chart Defined Pareto charts are used to identify and prioritize problems to be solved. They are actually histograms aided by the 80/20 rule adapted by Joseph Juran. Remember the 80/20 rule states that approximately 80% of the problems are created by approximately 20% of the causes.
Pareto Charts Slide 2 of 4 Constructing a Pareto Chart First, information must be selected based on types or classifications of defects that occur as a result of a process. The data must be collected and classified into categories. Then a histogram or frequency chart is constructed showing the number of occurrences.

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Pareto Charts Slide 3 of 4 An Example of How a Pareto Chart Can Be Used Pareto Charts are used when products are suffering from different defects but the defects are occurring at a different frequency, or only a few account for most of the defects present, or different defects incur different costs. What we see from that is a product line may experience a range of defects. The manufacturer could
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## This note was uploaded on 10/12/2010 for the course ISEN 314 taught by Professor M during the Spring '10 term at Texas A&M.

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Seven Quality Tools_Spring_2010 - Seven Quality Tools The...

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