This test has the feature of an objective criterion for checking its validity. Insane patients were used as the extremes representing extroversion and introversion. The method of scoring was determined by establishing an index value for each question and then giving additional weighting to those items with the highest index. The test was given to 40 subjects not used in the standardization series, and it differentiated them into two groups as distinctly as it did the original group from which it was standardized. (PsycINFO Database Record (c) 2006 APA, all rights reserved)