““Piaget's work on infancy is based on the diligent observation of and experimentation with his own three children, Lucienne (born 1925), Jacqueline (born 1927), and Laurent (born 1931) and comprises three volumes, The Origins of Intelligence in Children (OI; 1936/1952), The Construction of Reality in the Child (CR; 1937/1954), and Play, Dreams and Imitation in Children (PDI; 1945/1962). These volumes, which have been characterized as “three of the most remarkable and original documents in psychology” (Russell, 1978, p. 92), can justly be said to have revolutionized the way in which developmental psychologists think about and study infants (Vonèche & Vidal, 1985).””
