This case history describes a 16-year-old adolescent male who developed schizophrenia with prominent negative symptoms. For the previous 6 years his diagnosis had been oppositional defiant disorder or conduct disorder. The clinical presentation, differential diagnosis, and management are discussed. The case exemplifies issues addressed in DSM IV. J. Am. Acad. Child Adolesc. Psychiatry, 1993, 32, 6:1295–1301.