![]() Pareto noticed that approximately 80% of Italy's land was owned by 20% of the population. Pareto's observation was in connection with population and wealth. Later during his career, Juran preferred to describe this as "the vital few and the useful many" to highlight that the contribution of the remaining 80% should not be discarded entirely. Juran applied the observation that 80% of an issue is caused by 20% of the causes to quality issues. Pareto noted that approximately 80% of Italy's land was owned by 20% of the population. Juran, a Romanian-born American engineer, came across the work of Italian polymath Vilfredo Pareto. It is an adage of business management that "80% of sales come from 20% of clients." History ![]() ![]() Many natural phenomena distribute according to power law statistics. Mathematically, the 80/20 rule is roughly described by a power law distribution (also known as a Pareto distribution) for a particular set of parameters. The Pareto principle is only tangentially related to the Pareto efficiency. In his first work, Cours d'économie politique, Pareto showed that approximately 80% of the land in the Kingdom of Italy was owned by 20% of the population. Juran developed the concept in the context of quality control and improvement after reading the works of Italian sociologist and economist Vilfredo Pareto, who wrote about the 80/20 connection while teaching at the University of Lausanne. Other names for this principle are the 80/20 rule, the law of the vital few, or the principle of factor sparsity. The Pareto principle states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few"). 20% of the donors contributing towards 80% of the total The Pareto principle may apply to fundraising, i.e. ( Learn how and when to remove this template message) Please help improve this article by citing reliable, secondary sources that evaluate and synthesize these or similar examples within a broader context. This article focuses too much on specific examples without explaining their importance to its main subject.
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