The referenced paper on deliberate practice by Ericsson has been linked on HN many times before.<p>Here's a link I found on Google: <a href="http://projects.ict.usc.edu/itw/gel/EricssonDeliberatePracticePR93.pdf" rel="nofollow">http://projects.ict.usc.edu/itw/gel/EricssonDeliberatePracti...</a>