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I'm lacking of an academic background. I thought there were only 4 or 16 personality traits. But a fast search on google is showing a huge number: according to this link they should be 638.

Is this information correct?

Which are the most accredited tests for measuring personality traits?

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I think this is an OK question! I even had a similar exam question as a student for my personality psychology course: "Why big 5 instead of big 3 or small 16?" (i.e. Costa&McCrae vs. Eysenck vs. Spearman). –  Ana Mar 27 at 1:32
    
@Ana: thanks, if you like it I would appreciate a +1! –  Revious Apr 9 at 12:12
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How many personality factors are there? The history of personality testing can be summarised in terms of an initial period where there was a vast number of personality traits. In response to this, there have been various attempts to synthesise these traits into a smaller number of underlying factors. There is a huge literature on this process (e.g., Digman, 1990; McCrae & John, 1992).

There are a lot of researchers who have proposed variations on the five factor model (commonly labeled OCEAN: openness, conscientiousness, extraversion agreeableness, and neuroticism). That said, you will find a range of other factorial models (e.g., Eysenk's three factor model; the HEXACO six factor model).

There has also been subsequent challenges to the resulting dominance of factorial models. For example, see the research of Sampo Paunonen (e.g., Paunonen & Ashton, 2001) which suggests that we may have gone too far in embracing the factorial models of personality.

Related to this debate, there are a range of hiearchical theories of personality where facets are nested within factors. So you can either get a very general representation of personality with say 5 factors, and a more detailed representation with say 30 facets.

What are valid measures of these factors? There are a large number of well validated personality tests. Tests are typically built around particular representations of personality. There are a range of free measures of the Big 5 listed here with some discussion around validity.

The NEO is one of the most well-known and used commercial measures of the Big 5. That said, there are a wide range of well validated commercial personality tests available.

References

  • Digman, J. M. (1990). Personality structure: Emergence of the five-factor model. Annual review of psychology, 41(1), 417-440.
  • McCrae, R. R., & John, O. P. (1992). An introduction to the five‐factor model and its applications. Journal of personality, 60(2), 175-215.
  • Paunonen, S. V., & Ashton, M. C. (2001). Big five factors and facets and the prediction of behavior. Journal of personality and social psychology, 81(3), 524.
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Is it "bad" to open a question asking how NEO relates to MBTI? –  Revious Apr 9 at 12:17
    
Have you seen this answer? cogsci.stackexchange.com/questions/1546/… –  Revious Apr 9 at 13:29
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