Synopsis More and more psychologists and educators have come to the view that it is highly necessary to study child behaviour as a separate discipline to modify child behaviour and his development. There is a need to write books on child psychology. Consequently, of great importance to teachers, parents, and mental hygienists is the fact that growth is most rapid during the early years of life. Scientific evidence supports the assumption that these are the golden years for personality development. By establishing the proper controls in the home and the school, it is possible to ensure the most rapid during the early years of life. Scientific evidence supports the assumption that these are the golden years for personality development. By establishing the proper controls in the home and the school, it is possible to ensure the most desirable sort of growth. Particularly is it true that modern progressive education provides situations which afford the proper type of experiences. In the conventional school, on the other hand, many basic principles of mental hygiene are flagrantly violated.