Table of Contents
Abstract
The International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5) is a concise, 50-item self-report assessment designed to measure the domains of the Big Five personality traits (FFM). This public-domain instrument was developed by Lewis R. Goldberg utilizing items from the International Personality Item Pool (IPIP). The IPIP-Big5 is structurally aligned with the domains assessed by the revised NEO Personality Inventory (NEO-PI-R), a widely recognized measure of personality. It provides scores across five key dimensions: Extraversion, Agreeableness, Conscientiousness, Emotional Stability (the inverse of Neuroticism), and Openness to Experience. The scale is appropriate for adults ranging in age from 16 to 81, providing age- and gender-specific norms derived from non-clinical samples.
Keywords
IPIP-Big5, Five Factor Model, FFM, NEO-PI-R, International Personality Item Pool, Personality Assessment, Psychometrics, Lewis R. Goldberg, Emotional Stability
Authors
Lewis R. Goldberg, Thomas Buchanan, John A. Johnson
Purpose
The primary purpose of the IPIP-Big5 (50-item version) is to provide a brief, psychometrically sound, and publicly accessible measure of the five major dimensions of human personality. It was specifically developed to serve as a broad-bandwidth, public-domain alternative to proprietary instruments, such as the NEO-PI-R.
By leveraging the extensive item bank of the International Personality Item Pool, the scale aims to facilitate research and assessment in personality psychology by offering a standardized instrument that is free from restrictive licensing fees. The scale is intended for use in describing an individual’s general behavioral tendencies and temperamental characteristics across the five factors.
Construct
The IPIP-Big5 measures the five global domains of the Five Factor Model (FFM), often referred to as OCEAN:
- Extraversion: Reflects sociability, assertiveness, excitement-seeking, and positive emotions.
- Agreeableness: Measures the tendency to be compassionate, cooperative, and kind, rather than suspicious or antagonistic towards others.
- Conscientiousness: Assesses the degree of self-discipline, dutifulness, organization, and the drive for achievement.
- Emotional Stability: This factor is scored as the reverse of Neuroticism, reflecting low levels of unpleasant emotions such as anxiety, anger, depression, and vulnerability. Low scores indicate a tendency toward psychopathology.
- Openness to Experience (Intellect): Captures the degree of intellectual curiosity, creativity, aesthetic appreciation, and a preference for novelty and abstract ideas.
Validity
The validity of the IPIP-Big5 has been extensively documented through its high correlation with the established NEO-PI-R. Studies confirmed that the IPIP-Big5 domain scores correlate strongly with their corresponding NEO-PI-R counterparts, demonstrating concurrent validity. Specifically, correlation coefficients ranged from .85 to .92 when corrected for unreliability, confirming that the IPIP scales effectively measure the same underlying constructs as the proprietary instrument.
Furthermore, the IPIP-5-50 scales demonstrated superior predictive validity in certain contexts. Research by Buchanan, Johnson, and Goldberg (2005) indicated that the IPIP scales outperformed the NEO-PI-R versions of the same constructs when used as predictors of various clusters of self-reported behavioral acts among 2,448 participants. Subsequent validation studies, including those conducted in diverse international samples (e.g., Dutch participants by Lamers et al., 2012; Scottish participants by Gow et al., 2005), consistently supported the measure’s construct and predictive validity.
Reliability
The reliability of the IPIP-Big5 is supported by its strong internal consistency and its established relationship with the gold standard of personality measurement. The development process, rooted in the International Personality Item Pool, ensured that items were selected based on robust psychometric properties.
While specific Cronbach’s alpha values for the 50-item version across all major validation studies are not explicitly detailed in the original description, the reported high correlations with the NEO-PI-R (up to .92 when corrected for attenuation/unreliability) imply high reliability for both instruments, suggesting that the IPIP-Big5 possesses acceptable to high internal consistency for its five domain scales. Gow et al. (2005) specifically reported on the internal consistency and concurrent validation of the IPIP Big-Five factor markers in their Scottish study.
Factor Analysis
The structural integrity of the IPIP-Big5 is confirmed by factor analysis. Buchanan, Johnson, and Goldberg (2005) conducted a major evaluation of the scale’s structure, finding that the results of the factor analysis strongly supported the formation of the five intended constructs (Extraversion, Agreeableness, Conscientiousness, Emotional Stability, and Openness).
This statistical confirmation validates the scale’s adherence to the established structure of the Five Factor Model. The five factors emerged clearly and correlated significantly with external behavioral criteria, confirming that the items load appropriately onto their respective domains, providing strong evidence for the measure’s construct validity.
Instrument
Test Type: Self-report personality inventory
Format: 50 items, 5-point Likert scale response format (ranging from “Very inaccurate” to “Very accurate”).
Language Available: English (Original), with translations available through the International Personality Item Pool (IPIP) collaboratory.
Population Group: General population (non-clinical samples used for norms).
Age Group: 16 to 88 years (validated range in studies).
Population Details: Validation studies have included large samples from the general population, including participants aged 16 to 81 (Goldberg, 1999) and 18 to 88 (Lamers et al., 2012), providing gender- and age-specific norms for standardized interpretation.
Test Methodology: Summing or averaging scores for the 10 items associated with each of the five factors. Scoring ranges from 10 to 50 per domain. Items are reverse-scored where necessary (e.g., for Emotional Stability, which reverses Neuroticism items).
Keywords
Personality inventory, FFM, Openness, Extraversion, Agreeableness, Conscientiousness, Neuroticism, Goldberg, Public Domain, Psychological Well-being
Authors
Author ORCID Identifier: N/A (Information not provided in source.)
Affiliation Email addresses: N/A (Information not provided in source.)
Correspondence Address: N/A (Information not provided in source. Primary resource is the IPIP website.)
Permissions & Fee and Test Year
The International Personality Item Pool, from which the IPIP-Big5 (50-item) scale is derived, is explicitly a public-domain resource. This means the items and the scale structure are available for use by researchers and practitioners without licensing fees or permissions required from the original author, Lewis R. Goldberg. The scale was initially developed and referenced in 1999.
Reference’s
Buchanan, T., Johnson, J. A., & Goldberg, L. R. (2005). Implementing a five-factor personality inventory for use on the internet. European Journal of Psychological Assessment, 21, 115-127.
Goldberg, L. R. (1999). A broad-bandwidth, public-domain, personality inventory measuring the lower-level facets of several five-factor models. In I. Mervielde, I. Deary, F. De Fruyt, & F. Ostendorf (Eds.), Personality psychology in Europe, Vol. 7 (pp. 7-28). Tilburg, The Netherlands: Tilburg University Press. Available online: http://ipip.ori.org/newBroadbandText.htm
Gow, A. J., Whiteman, M. C., Pattie, A., & Deary, I. J. (2005). Goldberg’s ‘IPIP’Big-Five factor markers: Internal consistency and concurrent validation in Scotland. Personality and Individual Differences, 39(2), 317-329.
International Personality Item Pool: A Scientific Collaboratory for the Development of Advanced Measures of Personality Traits and Other Individual Differences (http://ipip.ori.org/). Internet Web Site.
Lamers, S. M. A., Westerhof, G. J., Kovács, V., & Bohlmeijer, E. T. (2012). Differential relationships in the association of the Big Five personality traits with positive mental health and psychopathology. Journal of Research in Personality, 46(5), 517-526.
Items of the International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5)
IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.
| Very inaccurate | Moderately inaccurate | Neither accurate nor inaccurate | Moderately accurate | Very accurate | ||
| Tend to vote for conservative political candidates | 5 | 4 | 3 | 2 | 1 | |
| Have frequent mood swings | 1 | 2 | 3 | 4 | 5 | |
| Am not easily bothered by things | 5 | 4 | 3 | 2 | 1 | |
| Suspect hidden motives in others | 5 | 4 | 3 | 2 | 1 | |
| Enjoy hearing new ideas | 1 | 2 | 3 | 4 | 5 | |
| Believe in the importance of art | 1 | 2 | 3 | 4 | 5 | |
| Have a vivid imagination | 1 | 2 | 3 | 4 | 5 | |
| Am the life of the party | 1 | 2 | 3 | 4 | 5 | |
| Am skilled in handling social situations | 1 | 2 | 3 | 4 | 5 | |
| I am always prepared | 1 | 2 | 3 | 4 | 5 | |
| Make plans and stick to them | 1 | 2 | 3 | 4 | 5 | |
| Dislike myself | 1 | 2 | 3 | 4 | 5 | |
| Respect others | 1 | 2 | 3 | 4 | 5 | |
| Insult people | 5 | 4 | 3 | 2 | 1 | |
| Would describe my experiences as somewhat dull | 5 | 4 | 3 | 2 | 1 | |
| Seldom feel blue | 5 | 4 | 3 | 2 | 1 | |
| Very inaccurate | Moderately inaccurate | Neither accurate nor inaccurate | Moderately accurate | Very accurate | ||
| Don’t like to draw attention to myself | 5 | 4 | 3 | 2 | 1 | |
| Carry out my plans | 1 | 2 | 3 | 4 | 5 | |
| Am not interested in abstract ideas | 5 | 4 | 3 | 2 | 1 | |
| Have a sharp tongue | 5 | 4 | 3 | 2 | 1 | |
| Make friends easily | 1 | 2 | 3 | 4 | 5 | |
| Tend to vote for liberal political candidates | 1 | 2 | 3 | 4 | 5 | |
| Know how to captivate people | 1 | 2 | 3 | 4 | 5 | |
| Believe that others have good intentions | 1 | 2 | 3 | 4 | 5 | |
| Am very pleased with myself | 5 | 4 | 3 | 2 | 1 | |
| Do just enough work to get by | 5 | 4 | 3 | 2 | 1 | |
| Find it difficult to get down to work | 5 | 4 | 3 | 2 | 1 | |
| Carry the conversation to a higher level | 1 | 2 | 3 | 4 | 5 | |
| Panic easily | 1 | 2 | 3 | 4 | 5 | |
| Avoid philosophical discussions | 5 | 4 | 3 | 2 | 1 | |
| Accept people as they are | 1 | 2 | 3 | 4 | 5 | |
| Do not enjoy going to art museums | 5 | 4 | 3 | 2 | 1 | |
| Pay attention to details | 1 | 2 | 3 | 4 | 5 | |
| Keep in the background | 5 | 4 | 3 | 2 | 1 | |
| Feel comfortable with myself | 5 | 4 | 3 | 2 | 1 | |
| Waste my time | 5 | 4 | 3 | 2 | 1 | |
| Get back at others | 5 | 4 | 3 | 2 | 1 | |
| Very inaccurate | Moderately inaccurate | Neither accurate nor inaccurate | Moderately accurate | Very accurate | ||
| 1 | 2 | 3 | 4 | 5 | ||
| Don’t talk a lot | 5 | 4 | 3 | 2 | 1 | |
| Am often down in the dumps | 1 | 2 | 3 | 4 | 5 | |
| Shirk my duties | 5 | 4 | 3 | 2 | 1 | |
| Do not like art | 5 | 4 | 3 | 2 | 1 | |
| Often feel blue | 1 | 2 | 3 | 4 | 5 | |
| Cut others to pieces | 5 | 4 | 3 | 2 | 1 | |
| Have a good word for everyone | 1 | 2 | 3 | 4 | 5 | |
| Don’t see things through | 5 | 4 | 3 | 2 | 1 | |
| Feel comfortable around people | 1 | 2 | 3 | 4 | 5 | |
| Make people feel at ease | 1 | 2 | 3 | 4 | 5 | |
| Rarely get irritated | 5 | 4 | 3 | 2 | 1 | |
| Have little to say | 5 | 4 | 3 | 2 | 1 | |
Cite this article
Mohammed looti (2025). International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5). Psychological Scales & Instruments Database. Retrieved from https://db.arabpsychology.com/scales/international-personality-item-pool-five-factor-model-50-ipip-big5/
Mohammed looti. "International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5)." Psychological Scales & Instruments Database, 27 Oct. 2025, https://db.arabpsychology.com/scales/international-personality-item-pool-five-factor-model-50-ipip-big5/.
Mohammed looti. "International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5)." Psychological Scales & Instruments Database, 2025. https://db.arabpsychology.com/scales/international-personality-item-pool-five-factor-model-50-ipip-big5/.
Mohammed looti (2025) 'International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5)', Psychological Scales & Instruments Database. Available at: https://db.arabpsychology.com/scales/international-personality-item-pool-five-factor-model-50-ipip-big5/.
[1] Mohammed looti, "International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5)," Psychological Scales & Instruments Database, vol. X, no. Y, ص Z-Z, October, 2025.
Mohammed looti. International Personality Item Pool – Five Factor Model – 50 (IPIP-Big5). Psychological Scales & Instruments Database. 2025;vol(issue):pages.