First published in 1999. This volume is the third of a series devoted to
the first years of the child's development, the two others being
concerned with the beginnings of intelligence and the child's
construction of reality (La naissance de intelligence chez Venfant and
La construction du réel chez Venfant). Although this book contains
frequent references to the two other volumes, which deal with the same
three children and study the relationships between their mental
activities, it nevertheless constitutes in itself an independent and
complete study