In opening the discussion, Dr. Leo Kanner emphasizes the futility of seeking a single cause for all instances of juvenile delinquency. He divides delinquency into three types: 1, that due to pathology of the brain; 2, that due to pathology of relationships within the family; and 3, that representing social dislocation. The discussants agreed that psychotherapy may correct pathology resulting from disturbances of the second type in a stable social setting, but it is almost helpless in the face of disturbances of the third type. For the latter, environmental manipulation is most useful. It was noted that the symposium did not consider precise