The Pareto Principle was propounded by Vilfredo Pareto (1848-1923) when he observed that 20 percent of the people of Italy owned 80 percent of the wealth. This concept of disproportion often holds ..........to read more http://www.csun.edu/~jmotil/Pareto.pdfIt was in 1897 that an Italian named Vilfredo Pareto began studying patterns of wealth and income in 19th century England. Pareto attempted to mathematically......to read more http://www.theevansgroupllc.com/pages/articles/The80-20Rule.pdf