This month we are focusing on the diagnosis of psychotic disorders, with questions about the DSM-III diagnoses of scbizopbrenia, scbizopbren: form and schizo-affective disorders, and affective disorders with psychotic features. Readers are urged to submit questions about any aspect of DSM-III for future columns to Dr. Williams at the New York State Psychiatric institute, 722 West 168th Street, New York, New York 10032.