Piaget (1964) cited by E. L. Criswell (1989, pp. 35-36) developed the theory that children grow intellectually in stages: From years 0 to 2, children explore their tiny environments, and through physical exploration, learn that objects exist and do not change from day to day. This is the sensorimotor stage. This is a period of motor action. The way I see it, the time can be successfully used for...
Structure of Human Development: Implications for Instructional Design
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