Child Studies programs were developed and prospered under the Child Study Movement that S. Hall pioneered in the United States in the 19th century. O. Chrisman, a student of S. Hall, proposed a new concept, “Paidology”, defined as “the scientific study of the child”. This notion was introduced into Japanese academia and has been the basis for various activities in child studies in Japan ever since. Currently, many colleges and universities in Japan have child studies programs. What significance do child studies programs have in the curricula of Japanese universities which train childcare workers and kindergarten teachers? In this paper, the methods of child psychology peculiar to various child studies programs are viewed from three angles, and the validity of such methodologies, when they have in fact been mastered by the childcare workers and teachers involved in such programs, will be demonstrated.