Pareto’s Principal, also known as the 80/20 rule, this principle holds that for any given event, 80% of the results come from 20% of the activity.
For example, if you subscribe to Pareto’s Principle, then you probably believe that 8o% of the work in any organisation is performed by about 20% of the employees.
This sounds familiar, I also reckon that 80% of people use 20% of the features in most (bloated) software, just from a comparison of the feature-set and size of Photoshop and Gimp.