Gradually he pieced together a "blueprint" for normal cognitive development ... though it was hidden, the toy still existed. Piaget found four major developmental stages (with many subdivisions).

Early childhood is a time of crucial cognitive growth, including the ability to engage in pretend play, produce and ...

You might notice this stage when watching your child play with a toy ... over 70 years old, Piaget's theory is "still one of the prevailing theories in terms of cognitive development," Dr Sam ...

By thinking that children have great cognitive abilities, Piaget came up with four different cognitive development stages, which he put out into testing. Within those four stages he managed to group ...