Preventive Mental Health Services for children entering foster care describes a pioneering effort to reduce psychological problems among foster children. It compared a 15 session and a 40 session psychotherapy provided to children entering foster families in a suburb of New York City. Some psychological test advantages concerning mental health were shown for the 40 session versus 15 session modality. Important findings were that democratically permissive middle class foster parents were associated with a significant rise of I.Q. among children placed with them and placed children did better academically while in foster care than when returned to their biological families.