NOTE: Unevenness in Development. Some researchers claim that cognitive growth does not occur in stages all at once, as each individual possesses a number of abilities, each at different levels of development. Within each stage there are gradual and transitional changes which occur at different times depending on the particular abilities (Flavell, 1985).
[Zigler, Edward F. and Matia Finn-Stevensen, Yale University. CHILDREN, Development and Social Issues. Lexington, MA & Toronto: D.C. Heath and Company, 1987. See the chapter Cognitive Development During Middle Childhood 7 - 12.]
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