Definition:

The Rorschach inkblot test is a type of projective psychological evaluation created in 1921 by Hermann Rorschach. Used to analyze personality and emotional functioning, it is the second most commonly used forensic test after the MMPI. A 1995 survey 412 clinical psychologists in the American Psychological Association revealed that 82% used the Rorschach at least occasionally1

Critics note that the test's poor validity means that it is unable to accurately identify most psychiatric disorders. However, the test has shown to be effective in the diagnosis of illnesses characterized by distorted thinking, such as schizophrenia and bipolar disorder1.

1 Lilienfeld, S.O., Wood, J.M., & Garb, H.N. (2001). What wrong with this picture? Scientific American.

Source :http://psychology.about.com