A crucial,innovative idea of Jean Piaget's was that:

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Jean Piaget proposed that intelligence varies qualitatively with age, meaning that the way in which individuals think and process information changes as they develop and mature. He identified different cognitive stages of development, each characterized by specific ways of thinking and understanding the world. While Piaget did not deny the importance of quantitative changes in intelligence (such as increases in knowledge and problem-solving abilities), he believed that qualitative changes were more fundamental and transformative. Piaget's theory has had a major impact on psychology, education, and child development, and continues to be influential today.

A Crucial,innovative Idea of Jean Piaget's Was That