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The 85% Rule
Also called: 15.87% failure rate, 85 percent rule, 85% rule, eighty five percent rule
Definition
A practice-difficulty target where you aim to succeed about 85% of the time and miss about 15%, since a small, steady amount of error (mathematically optimal at 15.87%) gives the cerebellum and motor cortex the clearest signal to keep improving. When a drill is too easy raise the difficulty, and when you miss more than 3 in 10 simplify until you stabilize back in the 80-90% range.