Abstract: Classification is an important way of people's thinking activity. This article shows that in the sythetical classification ability of the wordconcepts in schoolchildren, factors of age characteristics are demonstrated. Theclassification ability is better than ability to explain grounds on the classific-ation. A few schoolchildren in grade 5 have a beginning ability of classifica-tion of "combination analysis". This Study shows too that, differences in classification material, culturalbackground and the condition of education impact the quality in the classific-ation.

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