The 80/20 Principle asserts that there is an inbuilt imbalance between inputs and outputs, causes and consequences, and effort and result. A minority of causes, inputs or effort usually lead to a majority of the result, outputs or rewards. Few things are important; most are not.

80/20 Principle: How To Get More From Less

10 Golden Rules for Successful Carriers

80/20 Theory of the Firm

80/20 Principles of Continuous Improvement

Apply the 80/20 Rule to Everything