 Research also shows that children develop explicit understanding at age 5 and as a result, the child will count the sweets to decide which has more.Finally the study found that overall quantity conservation is not a basic characteristic of humans' native inheritance.According to Jean Piaget, genetic epistemology attempts to "explain knowledge, and in particular scientific knowledge, on the basis of its history, its sociogenesis, and especially the psychological origins of the notions and operations upon which it is based".