Because DSM-IV is meant to be used by a diverse group of mental health professionals in a variety of settings, the Task Force on DSM-IV and the Work Groups solicited and encouraged the participation of a wide range of professionals to serve as advisers to the Task Force and individual Work Groups. Advisers included individuals from other health associations; clinical practitioners; researchers; forensic specialists; experts on gender, age, and cultural issues; and international experts. Advisory groups identified pertinent questions regarding each diagnosis; developed and critiqued literature reviews, text, and criteria; and participated in field-trial and data-reanalysis projects. The Task Force on DSM-IV and the Work Group members extend their appreciation and heartfelt thanks to the individuals and organizations who contributed so generously of their time and expertise.