# Pareto principle (80/20), explained

URL: https://gocutline.com/glossary/pareto-principle/

The Pareto principle, or 80/20 rule, is the observation that roughly 80% of results often come from 20% of the causes. It is named after Vilfredo Pareto, who noticed in the 1890s that about 80% of land in Italy was owned by 20% of the people; Joseph Juran later generalised it.

## What it means
The numbers are not exact and not a law of nature. The useful idea is that effort and results are rarely proportional: a few clients, products or habits usually matter far more than the rest.

## How to do it in a calendar
- In your weekly review, ask which 20% of your work produced most of last week's results.
- Give those tasks your best blocks.
- Cut, batch or delegate the rest.

## An example
A freelancer finds that two clients produce most of her income. Their work goes into morning blocks; the other clients share two afternoon blocks a week.

## Common mistakes
- **Treating 80/20 as exact.** It might be 70/30 or 90/10.
- **Cutting things that support the 20%.** Sleep and training are not output, but output depends on them.

## Questions

**Is it really always 80/20?**
No. It is a rule of thumb for uneven distributions, not a fixed ratio.

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Facts: https://gocutline.com/facts/ · Updated 2026-10-23