In the period since the first edition of Principles And Practice Of Child Psychiatry appeared, much new data and clinical experience have been reported. In bringing the volume up-to-date, we have notably enlarged several areas. While there was a woefully small amount of firm data on child psychopharmacology available in 1978, increasing knowledge in this field since then has enabled us to add this section. Similarly, we have expanded on such topics as learning disabilities, and the place of the school in child psychiatry. The discussions of childhood depression and mourning have been enlarged, and we have added the new insights that have emerged from ongoing longitudinal studies. Recent reports of both short- and long-term emotional consequences of traumatic experiences have also merited inclusion. Diagnostic terminology has been modified when necessary to comply with that of the Diagnostic and Statistical Manual of the American Psychiatric Association (DSM-III).