Abstract
Classificatory reasoning was studied in 58 children, 7 and 8 years old, who differed in operational level as well as in expertise. Knowledge about dinosaurs was used to distinguish expertise level. The children's performance on class-inclusion tasks involving the dinosaur content was a function of operational level. An overall effect of expertise was found for children's performance on class-membership measures. Furthermore, on the class-membership measures, expertise did not significantly influence the performance of children at the concrete-operational level, but it did for children at the pre-operational level. The results suggest that domain-specific knowledge and operational level may have different but interacting influences on children's classificatory reasoning.
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