There has been much dispute as to whether the study of educational principles is to be seen as part of the liberal element in the course, contributing to the teacher’s general education and personal development, or whether it is properly an adjunct to the professional sequence, serving to illuminate and enrich students’ method courses and practical work. Where it was well done, the study of the philosophy, sociology, and history of education and of educational psychology clearly served both ends and also provided an introduction to a systematic exploration of human conduct and affairs that was both educationally defensible and important in its own right. But all too often it was not well done. As the field of the social sciences grew, it became increasingly difficult for those employed in teacher-preparing institutions to keep pace. In some places, student teachers could follow courses in psychology, sociology, and so on given by recognized authorities in their respective disciplines, and in all countries there were some prominent social scientists who themselves took a close and direct interest in educational matters. But, given the large number of institutions responsible for teacher preparation and the fact that the majority of their staff were necessarily recruited for their teaching competence rather than for their high academic qualifications, much of the teaching of educational principles tended to become out-of-date and secondhand.<br />Keywords: principles, education, system