We can think of the eighty-five percent rule as the 80/20 rule when applied to failure itself, i.e., what’s the optimal level of failure if we want to learn more quickly and effectively?

It is through a mixture of success and failure that we can differentiate between effective and ineffective approaches, allowing for learning and progress.

Fail zero percent of the time and it leads to boredom and stagnation.

Selectively explore: After reading the conclusion and skimming the last chapter, read the introduction to understand the author's intentions and where they are heading.

Remember that originally, Pareto simply observed that land ownership was unequally distributed. However, this doesn’t mean that knowing this allowed him to predict who would be rich in the future and who would own land. It also told him nothing of why land was distributed that way, or how it might be changed. In other words, his law was purely

the eighty-five percent rule basically suggests that optimal learning occurs when individuals succeed or achieve the correct outcome around eighty-five percent of the time.

Then skim through the entire last chapter to grasp the overall message.

It’s even better if you can identify unifying principles behind these smaller facts.

By identifying and prioritizing this vital information, we can optimize our memory capacity and cognitive resources.