The Known 80-20

According to the Pareto Principle, (remember it's a guide not a scientific certainty), in any organisation:

80 percent of results come from 20 percent of efforts

80 percent of activity will require 20 percent of resources

80 percent of usage is by 20 percent of users

80 percent of the difficulty in achieving something lies in 20 percent of the challenge

80 percent of revenue comes from 20 percent of customers

80 percent of problems come from 20 percent of causes

80 percent of profit comes from 20 percent of the product range

80 percent of complaints come from 20 percent of customer

80 percent of work absence is due to 20 percent of staff