Know how to use "fewer" and "less"? Find out.
psychodiagnosis psy·cho·di·ag·no·sis (sī'kō-dī'əg-nō'sĭs)
Any of various methods used to discover the factors that underlie behavior, especially maladjusted or abnormal behavior.
The branch of clinical psychology that emphasizes the use of psychological tests and techniques for assessing mental illness.