What Is It Good For?
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Dr. Joseph Juran (of total quality management
fame) formulated the Pareto Principle after expanding on
the work of Wilfredo Pareto, a nineteenth century economist
and sociologist. The Pareto Principle states that a small
number of causes is responsible for a large percentage of
the effect--usually a 20-percent to 80-percent ratio.
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Recognizing the relationships the Pareto charts
reveal will allow you the opportunity to let participants have
a say in the decision process. By attacking the causes that really
matter, you will be more successful in identifying solutions that
might be more acceptable and useful.
You can apply this ratio in a number of ways:
- Addressing the most troublesome 20 percent of the problem
will solve 80 percent of it.
- Within your process, 20 percent of the individuals will
cause 80 percent of your headaches.
- In public involvement, 20
percent of the people will command 80 percent of your time.
- Of all the solutions you identify, about 20 percent are
likely to remain viable after adequate screening.
A Pareto chart can be a useful tool for graphically depicting
these and other relationships. The chart can help show you where
allocating time, human, and financial resources will yield the
best results. |
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How Do I Use It?
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Research by Dr. Juran and many others
has demonstrated that about 80 percent of the issues in
decisions that really matter falls within the social and
political realm. Thus, it does little good to have excellent
technical analyses and designs (the 20-percent arena) if
the 80-percent social and political arena is ignored or
poorly addressed. |
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Briefly, a Pareto Chart is a bar chart based
on cumulative percentages.
To create a Pareto Chart:
- Select the items (problems, issues, actions, publics, etc.)
to be compared.
- Select a standard for measurement.
- Gather necessary data (you may want to use a frequency
chart).
- Arrange the items on the horizontal axis in a descending
order according to the measurements you selected.
- Draw a bar graph where the height is the measurement you
selected.
Influence Diagrams can be used
with Pareto charts to show the relative importance of related
concepts.
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