Pareto Principle

The 80/20 Performance Rule

Vilfredo Pareto, an economist in the early 1900s, made a famous observation where 80% of the nation’s wealth belonged to 20% of the population. This was later generalized into what’s commonly referred to as the Pareto principle (also known as the 80-20 rule), which states for any phenomenon, 80% of the consequences come from 20% of the causes. We see this phenomenon in software engineering where 80% of the time is spent in only 20% of the code

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