What the 10,000 Hour Rule IsThe 10,000 hour rule is a concept that claims the best way to develop what’s called “world-class skill” is to have at least 10,000 hours of experience using the skill. The original report discussing the 10,000 hour rule was published in 1993 and used an example of musical students at an academy in Germany to reinforce the point. The students put in an average of 10,000 hours of practice by the time they had turned 20 years old, resulting in “world-class skill.” Why It Might Be WrongAnders Ericsson, who worked on the original study, claims in his new book that the 10,000 hour rule is much more complex than simply “practice makes perfect.” Alongside his co-author, R...