Quality management: Pareto diagrams as a means to get the facts straight on the web-site for teachers and learners of English as a secondary language from a German point of view providing teaching and learning strategies as well as Total Quality Management and assessments in schools and seminars.
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http://imedia.vuse.vanderbilt.edu/mt322/library.htm#Module 2
Pareto Diagram
Pareto Diagram. Pareto diagrams are named after Vilfredo Pareto, an Italian sociologist and economist, who invented this method of information presentation toward the end of the 19th century. The chart appears much the same as a histogram or bar chart, except that the bars are arranged in decreasing order from left to right along the abscissa. The fundamental idea of use of Pareto diagrams for quality improvement is the ordering of factors that contribute to a quality function.

Pareto Chart

Definition:
A bar graph used to arrange information in such a way that priorities for process improvement can be established.

Purposes:
To display the relative importance of data.
To direct efforts to the biggest improvement opportunity by highlighting the vital few in contrast to the useful many.

How to Construct:

Tips:
Category  Frequency  Percent of total  Cumulative % 
Wrong dose  100 50 50
Wrong time 70 35 85
Wrong medicine  15 7.5 92.5
Wrong patient  8 4 96.5
Medicine dc'd 4 2 98.5
Missed dose 3 1.5 100
Grand Total 200 100% 100%
 
Exercise (to do on your own): Construct a Pareto chart from the data above. 
Check the answer for yourself after you have finished.

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