Question: what is 80/20 and 64/4 rules?
Answer: Most of you are familiar with Vilfredo Pareto's famous 80/20 rule, which states that 80 percent of your results come from 20 percent of your efforts. ... That will give you the 64/4 rule (80/20 times 80/20) which tells you that two thirds (64 percent) of your results come from just 4% of your most effective time.