Outliers: The Story of Success · chapter 3 · id outliers-c3-08-gladwells-convergence-theory--

“Gladwell's convergence theory -- that beyond 120 IQ, personality and opportunity matter more than additional IQ points -- draws on work by Liam Hudson, but Hudson's 1966 research used small samples and has not been systematically replicated.”

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Receipts

ReviseSociology: Why Intelligence Doesn't Explain Successsource alive

The IQ threshold idea -- that above 120, additional IQ does not predict additional achievement -- originated with Liam Hudson's 1966 work 'Contrary Imaginations.'

Replication Index - Independent verificationsource alive

This claim is a stable, citable object. If you can falsify a verdict, tell us — corrections are loud here.