Which test is composed of 566 statements for true or false responses to indicate mental illnesses?

The Minnesota Multiphasic Personality Inventory (MMPI/MMPI-2) is indeed composed of a large number of statements—specifically 566 true or false questions—that are designed to assess various mental health conditions and personality attributes. The MMPI is one of the most widely used and researched psychological assessment tools in mental health, focusing on identifying psychopathology through its extensive inventory of statements. Each response helps to create a profile that can indicate the presence of mental disorders based on established psychological theories and norms.

The sheer number of items in the MMPI allows for a comprehensive evaluation of multiple psychological dimensions, including mood disorders, anxiety, and personality characteristics, making it a robust tool for clinicians. This breadth contributes to its effectiveness in distinguishing between various conditions and understanding an individual's psychological state, which is why it stands out in this context.