The lineage of the two conferences described in these volumes has been growing rapidly throughout the last ten years. In this country, a variety of meetings concerned with both the normal and the abnormal developmental behavior of infants, sponsored by the Macy Foundation and other groups, have paved the way for this type of discussion. The general series of Macy meetings set a pattern of bringing together members of many disciplines who might have knowledge bearing on a particular subject. In addition, a pattern of good reporting was established.
At the time of the termination of the Macy series on "Infancy and Childhood" (1947-1953) there began a similarly sponsored series of meetings on "Group Process" (1954-). It was evident that many of the participants at these latter meetings, where animal behavior and group psychology was being discussed, had knowledge in the field of child development that was of extreme importance.