The Pareto rule (also well known as the 80/20 rule) states that 80 percent of effects come from 20 percent of causes. Have you observed that only 20 percent of the people in a team are responsible for 80 percent of the results? Have you observed that only 20 percent of your friends support you 80 percent of the time? Do you wear only 20 percent of your clothes 80 percent of the time? The fraction might not be exactly 80/20. However, the essence is true—causes and effects are not directly proportional.
