The Pareto Principle

or the 80/20 rule : the idea that about 80% of the results come from 20% of the causes. It highlights that a small number of key efforts or inputs are responsible for the majority of the outcomes.

Examples:

* A company might find that 80% of its sales come from just 20% of its customers.

* In time management, you might find that 20% of your tasks produce 80% of your total results.

* Software Development: 80% of software errors & crashes are caused by 20% of the bugs.