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The Riso–Hudson Enneagram Type Indicator (RHETI) is an Enneagram of Personality psychometric test. Don Richard Riso and Russ Hudson began developing the RHETI test in 1993. Their research focused on constructing the RHETI as a personality measurement instrument.
The latest version consists of 144 pairs of forced-choice statements.
The RHETI has been found to be of heuristic value but minimal scientific research has been conducted.
References
Riso–Hudson Enneagram Type Indicator Wikipedia(Text) CC BY-SA