God, grant me the serenity to accept the things I cannot change, The courage to change the things I can, And the wisdom to know the difference. (Serenity Prayer, Reinhold Niebuhr)

Pareto Charts

A Pareto chart is a type of chart which contains both bars and a line graph. The bars display the values in descending order, and the line graph shows the cumulative totals of each category, left to right (Wikipedia).

AT&T uses a Pareto priority index (PPI) to evaluate improvement projects (Gryna 2007): PPI = (savings * probability of success) / (cost * years to completion)


Gryna, Chua, et al (2007), Juran's Quality Planning and Analysis, 5th Edition.