Not so fast. You seem to assume that measurement in this case is simple and non-controversial. In fact measuring the amount of deliberate practice is very hard.

Not so fast. You seem to assume that measurement in this case is simple and non-controversial. In fact measuring the amount of deliberate practice is very hard. How do you account for the difference in the types of activities individuals engaged in as children? How do you account for different levels of dedication and passion? How do you account for different amount of support from friends, family and institutions?