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Macnamara et al (2014) meta-analysis on deliberate practice not convincing

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Recently, Macnamara et al. (2014) published a meta-analysis which, they claimed, showed that "deliberate practice is important, but not as important as has been argued" by Ericsson et al. (1993) . Previously, I have written about earlier critical publications about Ericsson's work. Then, I thought these publications in several ways did not do justice to his work ( read this ). One of the authors of this new meta-analysis (Hambrick) was one of the authors whose publication I was critical about then. Now, I was curious whether this new publication would do justice to Ericsson and to the deliberate practice concept. Unfortunately, I don't think it does.