Jean Piaget’s training included heavy doses of both
biology and philosophy. From philosophy came
much of the content of his work. Piaget’s goal
throughout his career was to use the study of children to
answer basic philosophical questions about the nature and origins of knowledge. His research (22)---- shows a
consistent focus on what have long been central topics
in philosophy: the child’s understanding of space, time, and causality, of number and quantity, of classes and
relations, of invariance and change. Undoubtedly, one reason Piaget’s studies have attracted so much attention up till
now is that they identify such basic and important forms
of knowledge. Another reason is Piaget’s surprising,
and controversial, claim that these basic forms of
knowledge often take a long time to develop