The Pareto Principle

Economist Vilfredo Pareto found in 1897 that about 80 percent of Italy’s wealth was owned by about 20 percent of the population.⁸ This has become the 80/20 rule or the Pareto principle, which is often applied to a variety of disciplines. Although some say it should be adjusted to a 90/10 rule, this rule of thumb applies to everything from employee productivity and quality control to programming.

Barry Boehm found that 20 percent of a program consumes 80 percent of the execution time.⁹ He also found that 20 percent of software modules are responsible for 80 percent of the errors.¹⁰ Donald Knuth found that more than 50 percent of a program’s run time is usually due to less than 4 percent of the code.¹¹ Clearly, a small portion of code accounts for the majority of program execution time. Concentrate your efforts on these hot areas.

I just recently was doing some research on Javascript Optimization techniques and found this wonderful section on The Pareto Principle.  If you haven’t already read the above two paragraphs, please do.  If you feel brave, please try out this guide on Optimizing Javascript code.

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Tags: paretoprinciple, optimizing javascript, javascript, web development, research