Sound Bite: K. Anders Ericsson, a professor of psychology was the original source for the 10,000 Hour Practice Rule, also known as the 10 Year Rule of Necessary Preparation, that was touted by Malcolm Gladwell in his book, Outliers. Ericsson and several other researchers used data gleaned from their own practice experiences
Innate Talent: Myth or Reality. Lynn Helding. Journal of Singing. Vol. 67, #4. March/April, 2011.