ABSTRACT
My primary research interest has been and still is to elucidate developmen tal processes in infancy and early childhood. Most of our research has tried to take into account that what develops is not cognition or perception but children who perceive, who cognate, who feel, who simultaneously act upon the environment and are acted upon by the social and material forces and conditions in which they grow and to which they must adapt. The fascination lies with the manner in which diverse conditions, events and intrinsic characteristics combine and interact in such a way as to result in lawful developmental sequences that characterise the species as a whole and yet ensure enormous individual differences; no two children develop in the same manner.
