One hundred years old productivity method that still works — The Ivy Lee Method

The Ivy Lee Method is more than one hundred years old. It is deceptively simple, and to this day, it remains highly relevant and efficient thanks to its focus on prioritization and eliminating the irrelevant and insignificant from your daily schedule.

So, what is the Ivy Lee Method?
I've spent several days to create The Ultimate Guide to the Ivy Lee Method
I hope it will be helpful.