What is the 80/20 rule in simple terms?

What is the 80/20 rule in simple terms?

What is the Pareto principle? The Pareto principle states that for many outcomes, roughly 80% of consequences come from 20% of causes. In other words, a small percentage of causes have an outsized effect. While it is common to refer to pareto as 80/20 rule, under the assumption that, in all situations, 20% of causes determine 80% of problems, this ratio is merely a convenient rule of thumb and is not, nor should it be considered, an immutable law of nature.