Universal Principles of Design, Revised and Updated

1 Also known as Pareto’s Principle, Juran’s Principle, and Vital Few and Trivial Many Rule.

2 The first recognition of the 80/20 rule is attributed to Vilfredo Pareto, an Italian economist who observed that 20 percent of the Italian people possessed 80 percent of the wealth. The seminal work on the 80/20 rule is Quality Control Handbook by Joseph M. Juran (Ed.), McGraw-Hill, 1951.