History
The principle was studied by linguist George Kingsley Zipf who wrote Human Behaviour and the Principle of Least Effort: An Introduction to Human Ecology, first published in 1949. He theorised that the distribution of word use was due to tendency to communicate efficiently with least effort and this theory is known as Zipf's Law.
Within the context of information seeking, the principle of least effort was studied by Herbert Poole who wrote Theories of the Middle Range in 1985. Librarian Thomas Mann lists the principle of least effort as one of several principles guiding information seeking behavior in his 1987 book, A Guide to Library Research Methods.
Likewise, one of the most common measures of information seeking behavior, library circulation statistics, also follows the 80-20 rule. This suggests that information seeking behavior is a manifestation not of a normal distribution curve, but a power law curve.
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