Which psychological theory is Jean Piaget most known for?

Jean Piaget is most renowned for his theory of cognitive development, which is organized into four distinct stages. These stages, which are Sensorimotor, Preoperational, Concrete Operational, and Formal Operational, describe how children's cognitive abilities evolve as they grow. Piaget's emphasis was on how children actively construct knowledge through interactions with their environment, reaching different levels of understanding and reasoning as they progress through these stages.

This framework is foundational in developmental psychology and educational theory, influencing how educators approach teaching at different age levels. The clarity and structure of Piaget's four stages enable a deeper understanding of child development and cognitive growth, making it the most accurate choice given the options.