Dr. Buhler is a clinical psychologist specializing in severe mental disorders. Which of the following will be most useful for him when he diagnoses patients?

The MMPI-2-RF is a psychological assessment tool primarily used for personality evaluation and psychopathology screening. While it can provide valuable insights into a patient's personality traits and potential psychological issues, it does not serve as a diagnostic manual or provide the standardized criteria necessary for diagnosing specific mental disorders.

The MBTI is a personality assessment tool designed to categorize individuals into 16 personality types based on their preferences. It focuses on understanding personality rather than diagnosing mental disorders, making it less relevant for a clinical psychologist like Dr. Buhler who needs precise diagnostic criteria for severe mental disorders.

The TAT is a projective psychological test that assesses a person's social drives and emotions through storytelling based on ambiguous images. Although it can reveal aspects of an individual’s personality and emotional functioning, it lacks the structured framework needed for formal diagnosis, which is critical for Dr. Buhler’s work with severe mental disorders.