Abstract: This paper makes a factor analysis of the development and changein schoolchildren's intelligence. Three groups of children at the ages of6, 12 and 16 respectively from urban Shanghai were subjects of this cross-sectional study. WISC-R and CRT tests were used. The "general factor the-ory" and the "g_f-g_c theory" served as frameworks for the analysis ofthe results and the study of the developmental process of intelligence. Theauthor considers that the results supported to a certain extent the "diffe-rentination theory" on intelligence.

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