The editor of the journal Archives de Psychologie, Claparede, interested in your items offered him the post of director of study of the Institute J.J. Rousseau of Geneva, where Piaget conducted his scientific work for several decades (Ardila, 1989). During the time that work at the Institute he met Valentine Chantenay who was his collaborated and that later would marry (Ardila, 1989). Between 1921 and 1925 public respectively five books on child psychology, which aroused great anger and criticism around the world; in these years also worked as a Professor of the University of Geneva and then step to work at the University of Neuchatel until the year of 1929 (Ardila, 1989). Part of his research on the genesis of the intelligence, consistency and causality, two of his daughters were object of study (Ardila, 1989).

After starting his studies on child development, Piaget occupied countless charges and won a variety of awards, among them are: the offer of Professor of experimental psychology at the University of Geneva, named director of the laboratory of Fournoy in the Faculty of Sciences, was the first President of Switzerland society of psychology, in addition to these charges was editor of magazines such as Archives of Psichologie and Revue Suisse de Psichologie (Ardila, 1989). Universities like Harvard (1936), the Sorbonne (1946) and Brussels (1949) conferred him doctorates Honoris Causa (Ardila, 1989). The University of Brazil awarded him the title of Professor Honoris Causa and one of its members (Ardila, 1989) did the New York Academy of Sciences. Finally in 1969 the American Psycholical Association gave maximum recognition of the award for distinguished scientific contributions (Ardila, 1989). Theory of the balance according to Labinowicz (1982) Piaget qualify the child thought into four major periods: preparatory periods, prelogicos (pre-operational Sensomotriz) the Sensomotriz period is present from birth to two years of age. For Piaget (1964) at this stage are positioned the newly born and infant, where the child comes into the world with all their senses and some reflections that determine their survival, such as crying and sucking, through breastfeeding and sucking learns to perceive between size and shape (Labinowicz, 1982).