Jean-Jacques Rousseau has been called the father of the child-study movement. It has been said that Rousseau "discovered" the child (as an object of study).
Rousseau's principal work on education is Emile: Or, On Education, in which he lays out an educational program for a hypothetical newborn's education to adulthood. Rousseau provided a dual critique of both the vision of education set forth in Plato's Republic and also of the society of his contemporary Europe and the educational methods he regarded as contributing to it; he held that a person can either be a man or a citizen, and that while Plato's plan could have brought the latter at the expense of the former, contemporary education failed at both tasks. He advocated a radical withdrawal of the child from society and an educational process that utilized the natural potential of the child and its curiosity, teaching it by confronting it with simulated real-life obstacles and conditioning it by experience rather than teaching it intellectually. His ideas were rarely implemented directly, but were influential on later thinkers, particularly Johann Heinrich Pestalozzi and Friedrich Wilhelm August Fröbel, the inventor of the kindergarten.