Tests designed to gauge potential performance, such as occupational tests or achievement and aptitude tests, are usually administered and interpreted by an educated counselor. Psychological tests are administered and interpreted by a psychologist. Some standardized tests, such as cognitive ability tests, do not require skilled administrators, according to OPM.gov.
There are many categories of psychological tests. These include intelligence, neuropsychological, attitude, personality and specified clinical tests. A well-known example of a mental test is the Rorschach personality test, also known as the "inkblot" test. This test involves showing a series of cards with inkblot images to the subject who then describes a thought or feeling associated with it. These types of test are typically interpreted by professionals with a doctoral degree in clinical psychology.