I think I ran across this link from Raven the Maven’s site. She has the best project management blog around. Pareto analysis is a method by which you find the 80% of the problem caused by 20% of the ...

The Pareto Principle, also known as the 80-20 rule, is a powerful concept that can transform your approach to data analysis. This principle states that roughly 80% of effects come from 20% of causes.