Big Five Inventory: What the BFI and BFI-2 Measure

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Author: Ukrainian Psychological Hub · Published: October 9, 2026 · Editorial Policy

The Big Five Inventory (BFI) is a family of self-report personality questionnaires designed to assess five broad dimensions of personality. The original Big Five Inventory is a 44-item measure, while the Big Five Inventory-2 (BFI-2) is a substantially revised 60-item measure that assesses five broad domains and 15 more specific facets. Both belong to the Big Five measurement tradition. They are particular instruments for estimating trait tendencies, not definitions of the entire Big Five model, tests of intelligence, or clinical diagnostic procedures. For the wider assessment context, see Big Five Personality Test: What It Measures and How to Interpret Your Profile.

The distinction matters because the questionnaires differ in their item sets, labeling, hierarchical detail, and scoring conventions. The original BFI chiefly provides a relatively brief portrait of the five broad traits. The BFI-2 was designed to retain efficient assessment while providing a structured facet-level profile and reducing acquiescent response bias through balanced item keying. Its foundational development and validation are documented by Soto and John (2017).

Big Five Inventory: The Short Answer

The BFI is the original 44-item Big Five questionnaire associated with the work of Oliver P. John and colleagues. It assesses Extraversion, Agreeableness, Conscientiousness, Neuroticism, and Openness to Experience. It was developed as an efficient measure of broad personality dimensions using short, understandable descriptors.

The BFI-2 is the revised 60-item inventory developed by Christopher J. Soto and Oliver P. John. Its authors call the five scales Extraversion, Agreeableness, Conscientiousness, Negative Emotionality, and Open-Mindedness. In this instrument, each domain contains three designated facets. The authors' Berkeley Personality Lab description confirms the five domain labels, 15 facets, copyright position, and access information.

If the question is which questionnaire to choose, the full BFI-2 is generally more informative when a research question requires both broad domains and distinctions among the 15 BFI-2 facets. The original BFI remains scientifically relevant, particularly where consistency with earlier datasets, translations, or published designs is important. Appropriate selection depends on the population, language, validation evidence, access rights, study objectives, and available time.

What Is the Difference Between the Big Five Model and the Big Five Inventory?

The Big Five is a descriptive framework for organizing relatively enduring individual differences in personality. It identifies broad patterns across characteristics related to curiosity and imagination, self-regulation, social engagement, interpersonal orientation, and emotional sensitivity. The Five-Factor Model is a closely related tradition in personality research and assessment. The conceptual structure is introduced in Big Five Personality Traits: What They Are, What OCEAN Means, and How the Model Works; the terminology question is examined in Big Five vs Five-Factor Model: Are They the Same?.

An inventory is an operationalization: a specific collection of prompts, response options, scoring rules, and validation studies used to estimate particular constructs. The Big Five can be studied using the BFI, BFI-2, NEO family of questionnaires, International Personality Item Pool-based measures, and other approaches. Scores from different inventories are therefore related indicators, not automatically interchangeable numbers.

A common mistake is to assume that every Big Five test asks the same questions, uses the same domain names, divides each domain into identical subscales, or yields comparable percentiles. These assumptions can lead to inaccurate interpretation even when two tests share a five-domain framework.

How the Original 44-Item BFI Works

The original BFI was developed in the early 1990s in the Berkeley personality research tradition. Its widely used 44-item format asks respondents to indicate the extent to which short personality descriptions fit them. Responses are combined into domain scores using the appropriate version-specific scoring key, including reverse-keyed items.

The five original BFI domains are Extraversion, Agreeableness, Conscientiousness, Neuroticism, and Openness to Experience. Each domain is continuous. A higher score indicates greater endorsement of the characteristics sampled by that domain's items, relative to the meaning of its scale. A lower score indicates less endorsement. Neither score turns the person into a categorical personality type.

The original 44-item BFI was intended as a practical broad-domain assessment. Researchers have investigated its factor structure and relations to other measures, including early Spanish- and English-language work by Benet-Martínez and John (1998). It is particularly useful to distinguish this established 44-item instrument from later forms that use “BFI” in their names but implement different constructs at the facet level.

The original BFI should not be retroactively described as containing the same 15 facets as the BFI-2. A five-domain score from the original BFI represents its own item content and scoring design. Historical comparisons require evidence about how scores correspond across versions.

What the 60-Item BFI-2 Measures

The BFI-2 contains 60 items distributed across five broad domains: 12 items per domain. In the full form, every domain includes three facet scales with four items per facet. This creates a five-domain, 15-facet hierarchy specific to the BFI-2. The authors used conceptual and empirical analysis to develop items and evaluate the hierarchy in independent validation samples, including comparisons with self-reported and peer-reported criteria in their 2017 validation paper.

The BFI-2 is more detailed than the original BFI without approaching the length of much larger personality inventories. Its items use brief descriptive phrases and a standard five-point agreement response format. Its domain and facet labels should be retained accurately when presenting results.

Extraversion: Sociability, Assertiveness, and Energy Level

The BFI-2 Extraversion domain represents characteristic tendencies toward outward social engagement, active self-expression, and interpersonal energy. Its Sociability facet concerns enjoyment of being around people and engaging socially. Assertiveness concerns the tendency to speak up, express positions, and take a more active role in interactions. Energy Level concerns enthusiasm and energetic engagement.

These facets can vary within the same person. Someone may enjoy company while rarely taking charge of a conversation. Another may readily express opinions without preferring frequent social activity. A single Extraversion score summarizes multiple tendencies, while the BFI-2 facets can show where the individual pattern differs.

Agreeableness: Compassion, Respectfulness, and Trust

BFI-2 Agreeableness reflects tendencies in how people relate to others. Compassion concerns sympathetic and caring orientation. Respectfulness concerns considerate, cooperative behavior and regard for others. Trust concerns a more positive expectation about other people's intentions.

The three facets describe different aspects of interpersonal orientation. Someone might feel compassion while being cautious about trusting unfamiliar people. Variation across facets is one reason the full BFI-2 offers information beyond the domain average. These results do not grade moral character or determine whether a person is a good partner, friend, or employee.

Conscientiousness: Organization, Productiveness, and Responsibility

The Conscientiousness domain addresses habits related to orderliness, sustained effort, and dutifulness. Organization concerns preference for structure and keeping things orderly. Productiveness concerns applying oneself and finishing tasks. Responsibility concerns reliability in meeting obligations and expectations.

A respondent can be dependable without being especially tidy, or highly organized without consistently sustaining effort under every circumstance. The BFI-2 separates these tendencies for descriptive purposes. Associations between Conscientiousness and educational or occupational outcomes in other studies are probabilistic population findings and should never be read as guarantees about one person's performance.

Negative Emotionality: Anxiety, Depression, and Emotional Volatility

Negative Emotionality is the BFI-2's label for the domain closely related to the Neuroticism dimension named by many traditional Big Five measures. The BFI-2 facet labels are Anxiety, Depression, and Emotional Volatility. Here, Anxiety refers to a tendency toward worry or tension, Depression refers to a tendency toward sad or discouraged affect, and Emotional Volatility refers to more changeable or reactive emotional responses.

These are scale names within a personality inventory. In particular, the BFI-2 facet called Depression is not a depression diagnosis, and the facet called Anxiety is not an anxiety-disorder screen. The conceptual relationship and precise terminology are examined in the Hub's dedicated article, BFI-2 Negative Emotionality: How It Relates to Neuroticism.

Changing the BFI-2 domain name from Negative Emotionality to Neuroticism in a table, report, or database without identifying the instrument erases meaningful provenance. The scales are conceptually related; their items, scoring, normative interpretation, and finer structure must be analyzed instrument by instrument.

Open-Mindedness: Intellectual Curiosity, Aesthetic Sensitivity, and Creative Imagination

The BFI-2 calls its fifth domain Open-Mindedness. Its Intellectual Curiosity facet concerns engagement with ideas and intellectual exploration. Aesthetic Sensitivity concerns responsiveness to art and beauty. Creative Imagination concerns imagination and the generation of novel ideas.

Traditional Big Five questionnaires often call a closely related fifth domain Openness to Experience. The naming difference matters because an inventory's labels describe its particular operationalization. Open-Mindedness is not an intelligence test, and a score in this domain cannot establish how intelligent, innovative, educated, or artistically talented someone is.

BFI vs BFI-2: A Practical Comparison

The original BFI uses 44 items and is principally organized around five broad Big Five scores. The full BFI-2 uses 60 items, five broad domain scores, and 15 designated facet scores. The original version traditionally uses the names Neuroticism and Openness, while the BFI-2 uses Negative Emotionality and Open-Mindedness.

BFI-2 item construction also puts particular emphasis on balancing positively and negatively keyed content within its scales. Its validation study found advantages in hierarchical structure, response-style control, and criterion-related performance under the conditions studied. These results support the specific development claim; they do not mean that the BFI-2 invariably outperforms every other personality instrument in every sample or setting.

If a project already has longitudinal BFI-44 data, switching to BFI-2 should be treated as a measurement change. A researcher may need bridging analyses or a justified linking strategy before comparing earlier and later scores. The two instruments should not be combined into one unqualified raw-score series.

BFI-2, BFI-2-S, and BFI-2-XS: Which Version Is Which?

The full BFI-2 has 60 items and was developed to estimate five domains and 15 facets. The BFI-2-S is a 30-item short form. The BFI-2-XS is a 15-item extra-short form. These are distinct research instruments, each with a different balance of coverage, efficiency, and measurement precision.

In their short-form development study, Soto and John (2017) found that the two shortened forms retained useful domain-level measurement properties. Facet-level claims require much greater care: the 30-item BFI-2-S may provide facet information in sufficiently large research samples, whereas the authors cautioned against using the 15-item BFI-2-XS to assess facets.

The distinction follows from item coverage. The full form draws on four items per facet, the 30-item form uses two items per facet, and the 15-item form samples one item from each facet to contribute to broad domain measurement. A single item does not establish a reliable stand-alone facet score. Shorter scales also limit how well respondents' idiosyncratic interpretations and item-level errors average out.

The extra-short form can be useful in research protocols where time is severely constrained and broad domains are sufficient. It is a poor choice for detailed individual personality feedback. A report claiming to display all 15 BFI-2 facets from a 15-item BFI-2-XS should be scrutinized for unsupported precision.

Does the BFI-2 Have 15 Facets or 30 Facets?

The BFI-2 has 15 defined facets, arranged as three within each of five domains. The 30-facet structure familiar from some NEO instruments belongs to a different instrument family. The Big Five framework itself establishes five broad domains but does not prescribe one universally valid list or count of lower-order components. For the scientific rationale behind five broad factors, see Why Are There Five Personality Traits?.

The Big Five Aspect Scales organize personality around 10 aspects, while the BFI-2 uses 15 facets. These are alternative approaches to mapping narrower individual differences. A facet label should always be coupled with its scale family when scientific precision matters.

How Are BFI and BFI-2 Questions Answered?

Both measures use self-descriptive language to ask how well personality descriptions fit the respondent. The standard full BFI-2 uses a five-point agreement scale from strong disagreement to strong agreement. Respondents should answer in terms of characteristic patterns rather than a single unusually stressful or rewarding day.

The questionnaire does not ask whether a person possesses one permanent personality category. Agreement with individual statements supplies imperfect observations that are aggregated across the relevant items. The resulting domain and facet estimates are designed to capture typical differences among people.

A response is not a direct observation of a hidden internal trait. People understand wording differently, differ in self-knowledge, and sometimes answer according to social expectations. BFI-2 design features mitigate certain response artifacts, but no self-report inventory eliminates all reporting or interpretation errors.

How BFI-2 Scoring Works

Scoring starts with the exact official version and its published scoring key. Each item contributes to one of the designated scales. Items that express the opposite of a trait are reverse-keyed before scale scores are combined. With a response scale coded from 1 through 5, reverse-keying generally transforms a response x into 6 minus x; the official form's item assignments and instructions remain authoritative for any actual calculation.

The full BFI-2 domain score is based on 12 items and each facet score on four items, according to its particular key. Research reports often express scales as item averages, which preserves a familiar response-metric range. An alternative standardized presentation is meaningful only when its basis is supplied.

Balanced true- and false-keyed content helps reduce acquiescence, the tendency to agree with statements regardless of their content. The original BFI-2 validation specifically examined this design feature. Balanced keying is a measurement strategy, not proof that dishonesty, careless answers, misunderstanding, or impression management cannot affect results.

Missing data require a transparent scoring rule. Small numbers of omitted items may be handled according to the instrument authors' guidance or a justified analysis plan, whereas substantial missingness can make scores unsuitable for interpretation. Researchers should document any prorating, exclusion criteria, or changes in scale administration rather than silently assuming that blank responses mean the midpoint.

How to Interpret BFI and BFI-2 Scores

A domain or facet score estimates the respondent's relative standing on a measured continuum. For example, a higher Conscientiousness score generally indicates more frequent endorsement of organization, productiveness, or responsibility items, according to the version used. A lower score indicates less frequent endorsement. The score is descriptive rather than a medical threshold. For comparison groups and percentiles, see Big Five Test Scores and Percentiles: What High, Low, and Average Results Mean.

The critical question is what comparison is being made. A raw average of 3.8 on one BFI-2 scale does not automatically represent the same percentile, practical meaning, or uncertainty as 3.8 on another scale. Item content and score distributions differ. The same numerical value can also occupy different places in distinct populations.

Raw Scores, Standard Scores, and Percentiles

A raw score is an aggregate of item responses. A standardized score compares that aggregate with a selected distribution, when the necessary means and standard deviations are available. A percentile expresses a person's position in a specified reference group. Each answers a different statistical question.

There are no universal Big Five thresholds that classify everyone as high, low, or average. An interpretive cutoff must be tied to a particular instrument, a defined population, and a defensible rule. The Berkeley Personality Lab's guidance states that there is no official BFI-2 manual containing published norms. References to age-related BFI distributions should not be treated as an official universal BFI-2 percentile system.

A commercial online profile may show colorful bars, categories, or percentile labels without identifying the reference sample or transformation. Such labels should be interpreted as claims made by that particular scoring service. Researchers and readers should ask for the version, language, raw-to-standard conversion, comparison group, and evidence that the norm group is relevant.

Can Two People Compare Their BFI-2 Scores?

Two people who completed the same version under comparable conditions can compare scores descriptively, although the precision of the difference still matters. If they completed different translations, abbreviated forms, or differently scored websites, the comparison becomes less straightforward.

Even a meaningful group difference does not disclose everything about a person. Two people with similar broad Extraversion scores can differ in Sociability and Assertiveness, and they can behave differently in particular contexts. Trait estimates summarize typical tendencies across settings; they are not exhaustive predictions of behavior.

Can You Combine BFI and BFI-2 Results into One Profile?

A mixed-version profile requires a specific scientific justification. Researchers may test convergence, estimate crosswalks, or evaluate how item changes affect scores. Merely renaming the fifth domain or rescaling raw means is insufficient. Reports should always preserve whether an estimate came from BFI-44, BFI-2, BFI-2-S, or BFI-2-XS.

How Reliable and Valid Are the BFI and BFI-2?

Reliability concerns the consistency of scores under specified conditions. Validity concerns the evidence supporting particular interpretations and uses of those scores. Both depend on the population, language, version, and intended inference. A reliable score can still be misinterpreted.

The BFI-2 was developed in three research studies examining content, hierarchical organization, and links to relevant self- and peer-reported outcomes. The authors reported encouraging measurement performance for the revised domains and facets. The findings justify the instrument as a research measure, while leaving room for later studies to evaluate different contexts and demographic groups.

A 2025 reliability-generalization meta-analysis synthesized 57 study data points from 34 articles with 43,715 participants, spanning a variety of languages and settings. Across the included studies, pooled internal-consistency estimates for five broad domains were generally good for both BFI-44 and BFI-2. Estimates for the BFI-2 domains were somewhat higher in that synthesis, although the analysis also identified heterogeneity among studies.

The meta-analysis does not establish that every future translation, abbreviated form, facet scale, or use in an unfamiliar population will have the same reliability. Moreover, pooled internal consistency alone cannot establish criterion validity, longitudinal equivalence, or the suitability of individual high-stakes decisions.

Why Facet Scores Need Particular Care

Facet scores are based on fewer questions than full domain scores. Less item coverage commonly increases sampling error and the impact of wording choices. A four-item BFI-2 facet can still be useful, especially in appropriately designed research, but small differences between facet estimates should not be overinterpreted.

There is also a bandwidth–fidelity tradeoff. Broad domains capture many related tendencies and can correlate with wider classes of outcomes; narrower facets may better describe which component relates to a particular outcome. Greater specificity is not inherently a guarantee of greater prediction. Researchers should compare models and establish validity against the outcome actually studied.

Does a Strong Correlation Prove That the BFI-2 Predicts an Individual's Future?

No. A correlation between BFI-2 scores and a group-level criterion describes a statistical tendency under the conditions of the study. It does not determine why the association exists, guarantee the outcome for a particular person, or establish that changing the trait score would cause a change in the outcome. Individual predictions require separate evidence and careful assessment of error, base rates, and external validity.

Self-Report and Observer-Report BFI-2 Forms

The familiar BFI-2 is a self-report inventory. The broader BFI-2 research program also includes informant-report applications, in which a knowledgeable observer rates a target person's typical characteristics. An observer's assessment adds a distinct perspective; it does not automatically reveal the person's “true personality.”

Self- and observer-ratings can disagree because each perspective accesses different situations and information. Respondents know some private experiences that observers cannot see, while observers may notice regularities the person overlooks. Agreement and disagreement therefore need an interpretation tied to the construct and the contexts observed.

Research on a French informant-report BFI-2 adaptation illustrates the importance of validating a particular language and report format rather than assuming that findings from one self-report questionnaire automatically transfer to another.

Cross-Cultural and Multilingual BFI-2 Assessment

The original BFI and BFI-2 have been studied in multiple languages. Early work on Spanish and English versions of the original BFI found support for broad trait measurement in the samples examined. Subsequent translated BFI-2 studies have investigated the hierarchical structure and group comparability.

For example, Shchebetenko and colleagues' Russian-language validation reported evidence for the BFI-2's five-domain, 15-facet structure and examined invariance across sex and age in the study samples. A 2025 Bangla BFI-2 validation found support for important psychometric properties but reported weaker evidence for invariance across the compared languages than across certain demographic groups.

This matters because translation equivalence involves more than translating words correctly. Vocabulary, response styles, social expectations, item meanings, and sampling can all affect measurement. Before comparing group means across languages, researchers should test whether the instrument functions comparably for those groups. The broad cross-cultural support for the Big Five does not imply that identical factor or facet structures appear in every lexical study, translation, or population.

What Can Distort a Big Five Inventory Result?

Self-report personality scores can be influenced by inaccurate self-description, limited self-knowledge, temporary circumstances, response fatigue, social desirability, item misunderstanding, and context-specific pressure. In hiring or other high-stakes situations, people may have particular incentives to present themselves favorably. Acquiescence can distort results when someone tends to agree with many statements independently of their content.

The BFI-2's balanced item design specifically addresses acquiescence at the scale level, but it cannot independently establish that a respondent was truthful, attentive, or understood each item as intended. A profile produced under pressure should be considered in light of that testing context.

Personality scores may also vary across repeated administrations. Some changes arise from ordinary measurement error or situational conditions; others may reflect genuine changes in characteristic tendencies over time. A change in the score is not, on its own, proof of a lasting personality transformation.

What the BFI and BFI-2 Cannot Tell You

A Big Five Inventory result is an assessment of personality trait dimensions. It cannot diagnose a psychiatric disorder, determine whether someone has anxiety or depression, establish cognitive ability, identify a fixed personality type, or decide whether a person is morally good, trustworthy in every situation, employable, or compatible with a particular partner. The distinction between a continuous score and a personality category is developed in Are the Big Five Personality Traits Types or Dimensions?.

The BFI-2 facets called Anxiety and Depression should be read as personality dimensions within that instrument. Questions about clinical symptoms and diagnosis require appropriately validated clinical methods and relevant professional evaluation.

The inventory also cannot establish causal pathways from personality to relationships, employment, educational attainment, health, or well-being simply by showing correlations. These outcomes are shaped by many interacting circumstances. The most accurate use of personality data is explanatory and probabilistic, with attention to uncertainty and intended purpose.

When Should Researchers Choose the BFI-2?

The full BFI-2 is a strong candidate when a study needs an efficient standardized Big Five assessment with a specific five-domain, 15-facet hierarchy, and when the available evidence supports its application to the target population. The BFI-2-S is a possible compromise when respondents have limited time and the research design can tolerate lower precision, especially at the facet level.

The original BFI may be appropriate when a study is designed to replicate earlier work or when established validation evidence exists for a particular original BFI adaptation. The BFI-2-XS can serve narrowly defined, time-limited domain-level research, but it should not be sold as a detailed 15-facet instrument.

Instrument selection should begin with the research question and the exact intended inference. It should then consider the population, translated version, evidence for score interpretation, item burden, accessibility, study setting, and licensing. A measure that works well for group research may be unsuitable for consequential judgments about one individual.

How to Obtain the Official BFI-2 and Scoring Materials

The Berkeley Personality Lab's BFI page is an official source for the BFI-2's description, research access, scoring information, and permission conditions. According to the authors, the BFI-2 is copyrighted and available for noncommercial research use; it is not simply a public-domain item collection. Commercial use requires separate permission.

Researchers should obtain the actual version and key through the instrument authors' designated channels, cite the relevant development and validation studies, and follow the permissions applicable to their intended use. An unofficial online test bearing the words “Big Five Inventory” may not contain the original instrument or use its validated scoring.

This article explains the instrument, its versions, and the scientific interpretation of its scores. It does not reproduce the copyrighted questionnaire or offer a scored test, and it should not be used to derive clinical conclusions.

Frequently Asked Questions

Is the Big Five Inventory the same as the Big Five personality model?

The Big Five is a broad personality framework. The BFI is a particular questionnaire used to operationalize that framework. Other questionnaires may measure similar broad domains with different item sets, scales, and facet structures.

How many questions are in the Big Five Inventory?

The widely used original BFI contains 44 items. The full BFI-2 contains 60. BFI-2-S has 30 items, and BFI-2-XS has 15. Different instruments and adaptations should be identified by their complete version names.

Does the BFI-2 test all five personality traits?

Yes. The BFI-2 measures Extraversion, Agreeableness, Conscientiousness, Negative Emotionality, and Open-Mindedness. These align broadly with the five-domain tradition, including traditional Neuroticism and Openness language, while preserving instrument-specific labels.

How many facets does the BFI-2 measure?

The full BFI-2 has 15 defined facets, three per domain. This arrangement belongs to the BFI-2. It should not be used to describe all Big Five inventories or confused with the 30 facets of certain NEO measures.

What is the difference between BFI and BFI-2?

The original BFI is a 44-item broad-domain questionnaire. The BFI-2 is a redesigned 60-item questionnaire with a systematic 15-facet hierarchy, revised labels for two domains, and balanced keying intended to help address acquiescent response tendencies.

Are BFI-2 results accurate?

Research supports the BFI-2's measurement properties in studied populations, including evidence from the original validation and subsequent studies. The quality of any particular score depends on the form, administration, population, language, responses, and intended interpretation. A statistically sound inventory can be misused if its result is treated as a deterministic individual forecast.

What does a high BFI-2 score mean?

It indicates greater endorsement of the characteristics represented by a specific domain or facet. Whether a result is relatively high depends on an appropriately identified comparison population and interpretation method. There are no universal cutoffs that divide everyone into fixed personality categories.

Are BFI-2 Anxiety and Depression scores diagnoses?

No. Anxiety and Depression are the names of two Negative Emotionality facets in the BFI-2. They refer to characteristic tendencies measured by personality questionnaire items. Clinical diagnosis relies on different assessment purposes and evidence.

Is BFI-2 better than the NEO or IPIP?

There is no universally superior Big Five inventory. The NEO family, BFI-2, and different IPIP-based measures vary in length, licensing, available facets, psychometric evidence, and populations studied. The correct comparison depends on a specific research or assessment purpose. For one instrument-family comparison, see NEO Personality Inventory: What the NEO-PI-3 and NEO-FFI Measure.

Can you take the BFI-2 online for free?

The developers provide information about research access and an online feedback option through their official lab page. Their stated permissions distinguish noncommercial research access from commercial use. Readers should verify whether any online questionnaire is the official instrument and how its profile is scored.

Can AI estimate a BFI-2 score from social media activity?

Statistical models can be trained to predict questionnaire scores from digital traces, but a prediction of self-report data is different from directly administering the BFI-2. Validity depends on the source population, features, ground-truth labels, model evaluation, fairness, consent, and out-of-sample generalization. A machine-generated score is not automatically equivalent to a validated BFI-2 assessment.

Can BFI-2 personality scores change over time?

Scores can change through measurement variation, changing circumstances, and sometimes substantive development in personality tendencies. Interpreting a repeated score requires the same version, comparable administration, measurement precision, and an appropriate research design.

References

Benet-Martínez, V., & John, O. P. (1998). Los Cinco Grandes across cultures and ethnic groups: Multitrait-multimethod analyses of the Big Five in Spanish and English. Journal of Personality and Social Psychology, 75(3), 729–750. https://doi.org/10.1037/0022-3514.75.3.729

Berkeley Personality Lab. (2026). Big Five Inventory (BFI-2): Official instrument overview, access, and scoring information. https://www.ocf.berkeley.edu/~johnlab/bfi.html

Husain, W., Haddad, A. J., Husain, M. A., Ghazzawi, H., Trabelsi, K., Ammar, A., Saif, Z., Pakpour, A., & Jahrami, H. (2025). Reliability generalization meta-analysis of the internal consistency of the Big Five Inventory (BFI) by comparing BFI (44 items) and BFI-2 (60 items) versions controlling for age, sex, language factors. BMC Psychology, 13, Article 20. https://doi.org/10.1186/s40359-024-02271-x

Lignier, B., Petot, J.-M., De Oliveira, P., Nicolas, M., Canada, B., Courtois, R., John, O. P., Plaisant, O., & Soto, C. J. (2024). A reliable instrument for making use of an overly neglected source of information on personality: The French adaptation of the Big Five Inventory-2 (BFI-2) informant-report form. L’Encéphale, 50(4), 391–399. https://doi.org/10.1016/j.encep.2023.08.005

Shchebetenko, S., Kalugin, A. Y., Mishkevich, A. M., Soto, C. J., & John, O. P. (2020). Measurement invariance and sex and age differences of the Big Five Inventory-2: Evidence from the Russian version. Assessment. https://doi.org/10.1177/1073191119860901

Siraji, M. A., Karim, F., Soto, C. J., & Haque, S. (2025). The Bangla Big Five Inventory-2: A comprehensive psychometric validation. Scientific Reports, 15, Article 11008. https://doi.org/10.1038/s41598-025-90264-0

Soto, C. J., & John, O. P. (2017a). The next Big Five Inventory (BFI-2): Developing and assessing a hierarchical model with 15 facets to enhance bandwidth, fidelity, and predictive power. Journal of Personality and Social Psychology, 113(1), 117–143. https://doi.org/10.1037/pspp0000096

Soto, C. J., & John, O. P. (2017b). Short and extra-short forms of the Big Five Inventory-2: The BFI-2-S and BFI-2-XS. Journal of Research in Personality, 68, 69–81. https://doi.org/10.1016/j.jrp.2017.02.004

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