The 80/20 rule, also known as the Pareto Principle, is the observation that roughly 80% of consequences come from 20% of causes. This principle suggests that a minority of inputs or efforts often leads to the majority of results in various domains, such as business, economics, and quality control. For example, 80% of a company's revenue might come from just 20% of its customers[1][2].
Originally noted by Vilfredo Pareto regarding wealth distribution in Italy, the principle was later developed by Joseph Juran, who applied it to quality management. Juran emphasized focusing on the 'vital few' causes that yield the most significant outcomes, enhancing efficiency and effectiveness in work processes[3][4].
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