THE WORKS (cont)
•The Language and Thought of the Child, published in 1923,
•Judgment and Reasoning in the Child; published in 1924;
•The Child’s conception of the world, published in 1926,
•The Child’s Conception of Physical Causality, published in 1930
•The Moral Judgment of Child, published in 1932
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Piaget’s put forth findings in his research in cognition area of children at the Maison des Petits of the Institute.
They issued progress reports sequentially of their research in his books: (1) The Language and Thought of the Child, published in 1923, (2) Judgment and Reasoning in the Child; published in 1924; (3) The Child’s conception of the world, published in 1926, (4) The Child’s Conception of Physical Causality, published in 1930, and The Moral Judgment of Child, published in 1932. From this publication one can gauge Piaget’s contribution in child development, particularly in area of mental growth and language development.

The common theme throughout his lifelong work is that of a developmental principle. He went through the research on an evolutionary process in which a person progresses from the mentality of a child to that of grown up to adulthood.
From Piaget’s observations, one can conclude that despite their interpersonal activity, children are much more egocentric and much less social in thought and speech than adults.