Tests based on peer-reviewed scientific research by psychometrics experts. Most tests measure personality traits using Big Five system. Tests include IQ, depression, anxiety, and personality styles. Some tests combine multiple scientific measures into single instruments
Official Enneagram test costs $20 USD. Takes about 40 minutes to complete. Provides comprehensive PDF report with scores for all 9 types. Includes detailed Type descriptions for top 3 types. Offers personalized growth recommendations
First personality tests appeared in 1919 with Woodworth Personal Data Sheet. Raymond Cattell developed 16PF questionnaire in 1940s. Galton and Thurstone pioneered lexical hypothesis in late 19th century
Created by Swiss psychologist Hermann Rorschach in 1921. Originally designed for schizophrenia diagnosis, later adapted for personality assessment. Ten inkblots printed on white cards, each approximately 18x24 cm
MMPI was created by Hathaway and McKinley in 1943 as a personality test. Original version had limited validity due to small sample size. Test was developed using empirical keying approach with patient endorsements
Created by Katharine and Isabel Briggs during WWII to help women find suitable jobs. Based on Carl Jung's 1921 psychological types theory. First published in 1962 by Educational Testing Service. Currently used by 50 million people and 10,000 businesses in US