Pareto’s Principle: 80/20

March 31, 2009

A high percentage of effects in any large system are caused by a low percentage of variables.

E.g. 80% of Web traffic is caused by 20% of Web sites

Aka Juran’s principle, Vital few, Trivial Many Rule

Based on Vilfredo Pareto (economist); seminal work: Quality Control Handbook (1951) by Joseph M Juran (ed.)

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