JMSL Chart Programmer's Guide

Quality Control and Improvement Charts >> Process Improvement Charts

Process Improvement Charts

Pareto Chart

Pareto charts are used to analyze the root cause of process defects. They are based on the "Pareto Principal" which claims that 80% of the defects are caused by only 20% of the defect categories

Pareto charts resemble bar charts but are different. In a Pareto chart, the defect category with the largest number of defects always appear as the first and tallest bar on the chart. The other bars represent the remaining defect categories in descending order of magnitude.

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