The good thing about the 80/20 rule is that you don’t have to understand statistics to be a believer. Yes it has foundations in economics and yes, it was “proven” using statistical analysis by a man named Pareto, but it is not meant to be understood only by economics professors.
Originally, the Pareto Principle referred to the observation that 80% of Italy’s wealth belonged to only 20% of the population.More generally, the Pareto Principle is the observation (not law) that most things in life are not distributed evenly. It can mean all of the following things:
- 20% of the input creates 80% of the result
- 20% of the workers produce 80% of the result
- 20% of the customers create 80% of the revenue
- 20% of the bugs cause 80% of the crashes
- 20% of the features cause 80% of the usage
- And on and on…
But be careful when using this idea! First, there’s a common misconception that the numbers 20 and 80 must add to 100 — they don’t!
20% of the workers could create 10% of the result. Or 50%. Or 80%. Or 99%, or even 100%. Think about it — in a group of 100 workers, 20 could do all the work while the other 80 goof off. In that case, 20% of the workers did 100% of the work. Remember that the 80/20 rule is a rough guide about typical distributions
