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The Pareto Chart

The Pareto Chart is a bar chart whose height reflects the frequency or impact of problems. The bars are arranged in descending order of height from left to right. The chart is useful in distinguishing the "vital few" from the "trivial many" problems which could be addressed by quality improvement teams. It is based on the Pareto Principle which states that 80% of the trouble comes from 20% of the problems.

METHOD:

1. Identify the problems and count how many times each one occurs.

2. Create a bar chart by placing categories on it arranged with the category with the most problems first, followed by other categories in order form the most problems to the least problems.

EXAMPLE:

In order to identify the most important problems, the City Center Hotel asked their housekeeping staff to complete a survey. Each of the workers filled out a survey for each shift they worked during the month of May. Below is a Pareto Chart showing their responses.

 

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