(Kudos to http://longtail.typepad.com for the pic)
Vilfredo
Pareto was an Italian Economist who noticed that, among other
things, a minority of the pea crop in his garden produced the majority
of the peas. A Pareto Analysis (also known as 80/20 Analysis)
identifies the "Critical Few" people and/or things that are the most
productive.
For example, 80% of sales are closed by 20% of salespeople
on the sixth callback. 80% of sales also come from 20% of your
customers, who buy 20% of your key products or services. 80% of your
own personal productivity occurs 20% of the time. 80% of bank deposits
are owned by 20% of depositors, and so on.