A Pareto Diagram or Chart is a bar chart that re-orders the categories so they are rank-ordered from the largest total occurrences to the smallest.
In process analysis, this helps identify the most frequently occurring problems or defect – or separate the vital few from the useful many.
The correct ranking for the Pareto chart categories from left to right would be from highest to lowest.
When You Should Use a Pareto Chart
- See Pareto Analysis for a fuller discussion.
- When analyzing the frequency of root cause data and you want to focus on the most significant contributors (the vital few).
- When you want to understand broad cause by looking at the component pieces.
- Very effective way to share a lot of information quickly.
How to Make a Pareto Chart
See the article here on how to make a Pareto Chart.
Pareto Diagram Example
Pareto charts can be easily created by tallying a check sheet, making a bar chart out of it, and re-ordering it.
Pareto Chart Videos
ASQ Six Sigma Green Belt Questions
Question: Which of the following tools can be used to identify and quantify the source of a problem?
(A) Affinity diagram
(B) Control chart
(C) Pareto chart
(D) Quality function deployment
Answer: (C) Pareto Charts are used to identify and quantify the source of a problem. Affinity diagrams help reduce processes to a few key steps. Control charts can show you your process has gotten out of control but won’t identify the source or quantify it. QFD is a planning process for adapting client’s needs to your plans.