[Justta]

First 20% of effort will finish 80% of the work. Second 20% effort will finish 16% of the 20% left.Totally 96% will be finished.

[abhorrence]

I once had a PM who loved the Pareto principle a little too much, and would constantly push us to "apply it" even after we already had. I got frustrated by this and drew the graph that goes along with your sentence, showing that miraculously about 99% of the work can be done with 60% of the effort!

My PM did not take the correct lesson away from the encounter.