80-20 Rule datingmentor.org/colorado. Real-World exemplory case of the 80-20 Rule What Is the 80-20 Rule? The rule that is 80-20 also called the Pareto Principle, is an aphorism which asserts that 80% of results (or outputs) derive from 20% of all of the causes (or inputs) for almost any offered occasion. In operation, a target […]