Concurrent validity and expanded interpretation of the M5–50

  • Craig Warlick
  • Paul B. Ingram
  • M. Alexandra Vuyk
  • Karen D. Multon


The M5–50 is a brief 50 item international personality item pool public-domain five-factor model personality instrument. While public-domain instruments can facilitate social justice by allowing access to instruments to those who may not have the financial resources to use a pay-to-use instrument, public-domain measures may lack the scrutiny given to pay-to-use instruments. This study provides scrutiny through examining the concurrent validity evidence of the M5–50 by correlating it to the proprietary NEO-PI-3. Additionally, to provide additional validity, this study also correlates the M5–50 domains with well-documented relationships with religious fundamentalism. Regarding the NEO-PI-3, the domains of Neuroticism and Conscientiousness appear to well represent their NEO-PI-3 domain counterparts, whereas Extraversion and Agreeableness had weak relationships with some facet-level content. Openness to Experience on the M5–50 appears able to align with both the Openness/Intellect model and a unified domain structure suggested by traditional five-factor model literature as M5–50 domains and items most strongly correlate with the Aesthetics and Ideas facets in the NEO-PI-3 Openness domain. Regarding religious fundamentalism, the M5–50 domain of Openness had an inverse relationship with fundamentalism, while extraversion had a positive relationship with fundamentalism. Interpretive recommendations for the M5–50 and recommendations for future development of brief, IPIP-based Openness to Experience domains are discussed.


IPIP NEO-PI-3 M5–50 Personality Five-factor model 


Compliance with Ethical Standards

Conflict of Interests

The authors declare no conflicts of interests.

Data Statement

The datasets for this study are not publicly available, but they are available upon reasonable request. The dataset we would provide would strip out individual item responses and they would provide composite information only.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Educational PsychologyUniversity of KansasKansasUSA
  2. 2.Michael E. DeBakey Veterans Affairs Medical CenterHoustonUSA
  3. 3.Department of Psychological SciencesTexas Tech UniversityLubbockUSA
  4. 4.Department of Psychology, School of Philosophy and Human Sciences, Independencia Nacional y ComunerosUniversidad Católica Nuestra Señora de la AsunciónAsunciónParaguay

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