A Preliminary Psychometric Validation of the Turkish Version of the EnneaTest

This thesis presents preliminary psychometric validation of the Turkish adaptation of the EnneaTest, a personality assessment instrument based on the theoretical framework of the Enneagram model. Originally developed by Francesco Bocci, Mirko Veratti, and Francesco Sarini, the EnneaTest aims to assess the nine personality typologies, also known as Enneatypes, defined by the Enneagram model through self-report items. This study begins with translating the original Italian version of the EnneaTest into Turkish and assessing and maintaining linguistic clarity, item comprehensibility, and conceptual correspondence with the original through a pilot evaluation. Following this, the study focuses on data collected via an online questionnaire, including both the Turkish adaptation of the EnneaTest and an additional validated personality measure (Taştan Personality Types Instrument), for a preliminary construct validity assessment, including convergent validity. The questionnaire, which includes both personality measures, consists of 137 questions in total (44 items from the Taştan Personality Types Instrument) and uses a 5-option Likert scale for the Turkish EnneaTest and a 7-option Likert scale for the Taştan Instrument. The statistical analysis in the thesis, conducted in JASP, includes descriptive statistics for the sample and items that emphasize the demographic characteristics and distribution of responses across the questionnaire items and Enneagram type scores, an internal consistency analysis for the preliminary reliability assessment, and a correlation analysis for the preliminary convergent validity assessment based on the responses of the items between the two instruments. Finally, the findings of the analyses are presented to provide preliminary evidence on the reliability and validity of the Turkish adaptation of the EnneaTest and to inform future cross-cultural validation research on Enneagram-based personality assessment.