Book excerpt: Assessing Adolescent Psychopathology: MMPI-A / MMPI-A-RF, Fourth Edition provides updated recommendations for researchers and clinicians concerning the MMPI-A, the most widely used objective personality test with adolescents, and also introduces the MMPI-A-Restructured Form (MMPI-A-RF), the newest form of the MMPI for use with adolescents. Further, this fourth edition includes comprehensive information on both MMPI forms for adolescents, including descriptions of the development, structure, and interpretive approaches to the MMPI-A and the MMPI-A-RF. This text provides extensive clinical case examples of the interpretation of both tests, including samples of computer based test package output, and identifies important areas of similarities and differences between these two important tests of adolescent psychopathology.