One highly important aspect of field testing is examination of how DSM-5 will perform in real-life settings. As a result, we have designed a simple type of field trial to be conducted among nearly 4,000 clinicians from private or smaller practices. Participants will include a random sample of 1,400 psychiatrists drawn from a physician database maintained by the AMA. This strategy ensures that these psychiatrists have the necessary training to recognize, diagnose, and treat mental illnesses—they are thus clinical experts whose input on DSM is greatly needed. Among this random selection of psychiatrists will be individuals with specialization in treating child, geriatric, and substance use populations. In addition, APA will ask 2,500 other clinicians to volunteer their time as participants. This group will consist of 1,500 psychiatrists, 500 psychologists, 500 social workers, and 500 psychiatric nurse practitioners.