ABSTRACT
Growth of children is so ubiquitous that for thousands and thousands of years it failed to arouse curiosity or stimulate inquiry as to the nature of its development. Elaborate research centers have been established for the sole purpose of studying the development of the child, and the physical, mental, emotional, motor, personality, and behavior development of the child have received both intensive and extensive analysis. The experimentalist has too often undertaken to establish principles of behavior development from data which represent only a phase or a section of the developing process. The development of a theory is in principle fundamentally akin to the development of behavior. For generation upon generation whatever body of knowledge adults had concerning the behavior development of children was obtained through no direct conscious effort to study child development. The investigation purports to analyze the process of development as it is manifest in the behavior of the growing infant and young child.
