The 5 / 95 rule, also known as the Pareto principle, is a concept that states 5% of efforts or inputs result in 95% of the outcomes or outputs. This rule is often used to describe the unequal distribution of resources, where a small portion of the population holds the majority of wealth or power. It can also be applied to productivity, where a small percentage of tasks or actions lead to the majority of results. This rule serves as a reminder to focus on the most impactful actions and prioritize them over less significant ones.