In mental health, family, and community counseling settings, master's-level counselors engage in unstructured clinical interviewing to develop diagnoses based on the "Diagnostic and Statistical Manual of Mental Disorders" (4th ed., text rev.; "DSM-IV-TR"; American Psychiatric Association, 2000). Although counselors receive education about diagnosis and the DSM classification system, the majority of them are not specifically trained in clinical interviewing. This article provides information about using the unstructured clinical interview to make a "DSM-IV-TR" diagnosis for adult clients with Axis I and Axis II disorders.