It has been often maintained that young children's knowledge is limited to perceptual appearances; in the preoperational stage of development, there are profound conceptual limitations in that they have little understanding of numerical and causal relations and are incapable of insight into the minds of others. Their apparent inability to perform well on traditional developmental measures has led researchers to accept a model of the young child as plagued by conceptual deficits. These ideas have had a major impact on educational programmes. Many have either accepted the view that the young are not ready for instruction, especially in subjects such as mathematics and science.
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