The Pareto Principle – also known as the ’80-20 Rule’ – is one of those ideas that crops up in many places. It is ubiquitous because it is an expression of a general principle of nature. It is an example of a power law. Extremely long rivers are rare. Small ones are very common. A small number of words appear frequently within a language, whilst there are very many words that we hardly use at all.
But what makes the Pareto Principle a valuable version of this phenomenon is that it is easy to articulate and understand. And it is therefore easy for managers to apply, to get better results. Consequently, since Joseph Juran rediscovered and named the idea in the 1930s, it has become an indispensable snippet of knowledge, for anyone in management.