80/20 Rule in

Software Development

20% of effort produces 80% of results, but the last 20% of results consumes 80% of the effort.

20% of software bugs require 80% of debugging effort.

In any website, web app, or software environment, the 80/20 rule tells us that 20% of the functionality and features in any one environment will be responsible for 80% of the results, or actions taken within that environment.