In explaining the development of children, Piaget believes that there discrete, qualitatively distinct and universal stages. There is a number of characteristics of Piaget's concept of stage.
First, Piaget views the course of intellectual development as progressive changes of cognitive structures. This means children will acquire cognitive skills along their development. For example, in the sensorimotor stage, an infant develops from a reflexive organism to an active body which begins to act intentionally, and at
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discrete and involve abrupt changes. The behaviours of children at one stage are qualitively different from behaviours at earlier stages. For example, Children with number conservation, unlike before, will not say that two rows of seven checkers with one row clustered into a smaller space contains different number of checkers. Children whose thinking depends on concrete things can suddenly learn to think abstractly and understand logics.
Here are the characteristics of Piaget's concept of stage.