ABSTRACT
PROFESSOR ARNOLD GESELL examined normal children and codified their development by stabilizing norms at 4 weeks, and every 4 weeks to 15 months, and then every 3 months to 24 months, and every 6 months up to 5 years. Through these norms it is possible to study, quantitatively, the development of the child in the four categories termed by Gesell: motor; adaptive; language; and personal-social, Before Gesell's test was introduced it was possible sometimes to get an impression of a certain backwardness, without being able to estimate its degree.
