Cognition refers to the way in which we gain knowledge through perception, memory, and thought processing. The cognitive approach regards the child as a spontaneously active individual who constructs his own knowledge of the world. Development is not a series of cumulative changes, but rather that as the child develops, the mind undergoes a series of reorganizations. With each reorganization, the child moves to a higher level of psychological functioning. Genetic epistemology .
Epistemology is the study of the nature of knowledge.
From the moment of birth the individual explores the environment with whatever level of capability he has, and through these explorations he learns, so that his views of the environment change. Based on his own three children. Ages in sequence not specific. Sequence, however, is invariant. Today, there are serious questions about some of his basic assumptions and findings.