The purpose of this study is to assess the reliability and validity of the thirty-six-item Open Enneagram of Personality Scales (OEPS). Our general hypothesis was that the OEPS would show adequate reliability evidence but not validity evidence. Participants were acquired through a small denominationally affiliated Midwest university, Amazon Mechanical Turk, and social media. Test-retest reliability was done with 249 participants, whereas internal consistency reliability, factor analysis, and correlations with the Big Five Inventory (BFI; John, Donahue, & Kentle, 1991) were done using 1,039 participants. An average Pearson’s correlation of .68 (range: 0.54 - 0.75) showed inadequate test-retest reliability for the OEPS factors. The average Cronbach’s Alpha was .46 (range: 0.27 - 0.56) for the internal consistency of the OEPS factors. Confirmatory factor analysis found insufficient evidence for the OEPS (χ2 = 1255, p < .001, CFI = 0.56, TLI = 0.50, and RMSEA = 0.08). This study used Pearson’s correlation coefficient to correlate OEPS factors with the BFI factors and found many correlations (-0.30 > r > 0.30) that support several of our predictions for convergent validity (See Table 2). There were also some relationships between the OEPS and BFI that were to be expected but were not supported in this study’s analysis, which is most likely due to the lack of strong psychometric support for the OEPS. Overall, this study showed OEPS did not show strong reliability or validity evidence.

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