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There is a correlation between culture fair, age, memory, vocabulary and cross-out speed and individual differences in initial performance on a letter-letter coding task, according to research seeking to identify how and why different cognitive abilities are interconnected in performance of a specific task. It was also established that memory also predicts systematic individual differences in rate of improvement over four 2-min trials. This research supports studies indicating that coding-type tasks are not necessarily pure measures of cognitive speed, separate from other cognitive abilities, but are potentially factorially detailed measures that also include elements of these other abilities.