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Jean Piaget (1896) is an expert in the field of psychology, but because his theory of cognitive development is divided into four stages of development, Jean Piaget has a major contribution to early childhood education, because these four stages, became one of the guidelines in understanding and apply the learning in early childhood.

In Piaget's theory, illustrated that the children's self-knowledge in building faced with two processes, namely assimilation and accommodation. That children not be separated from the process of adjusting the new acquisition with knowledge of the old, or establish new knowledge, from the previously unknown child, into the schemata. Or cognitive structures.

Broadly speaking, the fourth stage of development was described in Piaget's theory as follows:

1. Sensorimotor stage: from birth to 2 years (children experience their world through movement and senses or more dominated developments in the motor domain)
2. Pre-operational stage: from 2 to 7 years (during this age, children have learned to think but rather on efforts symbolization)
3. Concrete operational stage: from 7 to 11 years (children begin to think logically about concrete events)
4. Formal operational stage: after age 11 years (the development of abstract reasoning).

Here are some of the work of Jean Piaget, the famous:

• Inhelder, B. dan J. Piaget (1958). The Growth of Logical Thinking from Childhood to Adolescence. New York: Basic Books.
• Inhelder, B. dan Piaget, J. (1964). The Early Growth of Logic in the Child: Classification and Seriation. London: Routledge and Kegan Paul.
• Piaget, J. (1928). The Child's Conception of the World. London: Routledge and Kegan Paul.
• Piaget, J. (1932). The Moral Judgment of the Child. London: Kegan Paul, Trench, Trubner and Co.
• Piaget, J. (1952). The Child's Conception of Number. London: Routledge and Kegan Paul.
• Piaget, J. (1953). The Origins of Intelligence in Children. London: Routledge and Kegan Paul.
• Piaget, J. (1955). The Child's Construction of Reality. London: Routledge and Kegan Paul.
• Piaget, J. (1971). Biology and Knowledge. Chicago: University of Chicago Press.
• Piaget, J. (1995). Sociological Studies. London: Routledge.
• Piaget, J. (2001). Studies in Reflecting Abstraction. Hove, UK: Psychology Press