Development and validation of a questionnaire within the theoretical frame of the Enneagram

The study attempts to validate a questionnaire within the theoretical frame of the Enneagram, a personality theory composed of nine personality types. The study was carried out on a sample of 300 people in Italy, who had to rate on a scale from 1 to 5, a number of 123 items. The reliability of the questionnaire was analyzed on nine different factors resulting in an unsatisfactory internal consistency. Finally, the paper ends with recommendations to improve the present study and for other research conducted on the Enneagram.