The Pareto principle (aka the 80/20 rule): http://en.wikipedia.org/wiki/Pareto_principle http://en.wikipedia.org/wiki/Pareto_principle I've noticed this in my

The Pareto principle (aka the 80/20 rule): http://en.wikipedia.org/wiki/Pareto_principle http://en.wikipedia.org/wiki/Pareto_principle I've noticed this in my own business as well -- 80% of the effects come from 20% of the causes.