The Pareto principle (also known as the 80/20 rule) states that for many events, roughly 80% of the problems come from 20% of the causes. This statement is merely a rule of thumb and is not an immutable law of nature. More generally, a small subset of issues tend to cause most problems, and it is useful to identify those issues as they have the most impact on the process.
From the Statistical Reference Guide for Analyse-it 6.24.0: https://analyse-it.com/docs/user-guide/pareto-chart
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