Experience Precedes Understanding.

During The Earliest Stages The Child Perceives Things Like A Solipsist Who Is Unaware Of Himself As Subject And Is Familiar Only With His Own Actions.

During The Earliest Stages Of Thought, Accommodation Remains On The Surface Of Physical As Well As Social Experience.

Logic And Mathematics Are Nothing But Specialised Linguistic Structures.

Reflective Abstraction, However, Is Based Not On Individual Actions But On Coordinated Actions.

It Is With Children That We Have The Best Chance Of Studying The Development Of Logical Knowledge, Mathematical Knowledge, Physical Knowledge, And So Forth.