is the fourth and final stage of Jean Piaget's theory of cognitive development. It begins at approximately age 12 and lasts into adulthood. During the formal operational stage, children's thinking ...

Gradually he pieced together a "blueprint" for normal cognitive development in children ... Piaget found four major developmental stages (with many subdivisions). For the first year and a half ...

This is the second stage in his theory of cognitive development. It begins around age 2, when children start to talk, and ...

children enter the preoperational stage at around two years old Despite being over 70 years old, Piaget's theory is "still one of the prevailing theories in terms of cognitive development," Dr Sam ...