What is it?
The 80/20 rule evolved
from research carried out in the 1980s relating to portability. It states
the top 20% (the vital few) can achieve 80% results.
Concentrating on the bottom 80% (the useful many) may only achieve only
When to use it
Any time that you need to make a decision relating to two or more items,
for example, when carrying out Pareto analysis