International Personality Item Pool

{{Short description|Collaboratory of public domain personality test items}}

The International Personality Item Pool (IPIP) is a public domain collection of items for use in personality tests.{{cite web|url=http://ipip.ori.org/ipip/|title=International Personality Item Pool: A scientific collaboratory for the development of advanced measures of personality and other individual differences|last=Goldberg|first=L. R.|archiveurl=https://web.archive.org/web/20140524063221/http://ipip.ori.org/ipip/|archivedate=2014-05-24|url-status=dead|accessdate=2014-05-26}} It is managed by the Oregon Research Institute.Lewis R. Goldberg; John A. Johnson; Herbert W. Eber; Robert Hogan; Michael C. Ashton; C. Robert Cloninger; Harrison G. Gough. [http://ipip.ori.org/Goldberg_etal_2006_IPIP_JRP.pdf "The international personality item pool and the future of public-domain personality measures".]

The pool contains 3,329 items.The 3,329 IPIP Items in Alphabetical Order (plus their Survey and Item Number*) [https://ipip.ori.org/alphabeticalitemlist.htm] These items make up more than 250 inventories that measure a variety of personality factors, many of which correlate well to better-known systems such as the 16PF Questionnaire and the Big Five personality traits. IPIP provides journal citations to trace those inventories back to the publication as well as correlation tables between questions of the same factor and between results from different inventories for comparison.{{cite web |title=Single-Construct IPIP Scales |url=https://ipip.ori.org/newSingleConstructs.htm |website=ipip.ori.org}}{{cite web |title=Multi-Construct IPIP Inventories |url=https://ipip.ori.org/newMultipleconstructs.htm |website=ipip.ori.org |accessdate=6 March 2019}}{{cite web |title=16PF Comparison Table |url=https://ipip.ori.org/new16PFTable.htm |accessdate=6 March 2019}} Scoring keys that mention the items used for a test are given in a list form;{{cite web |title=Big-Five Factor Markers |url=https://ipip.ori.org/newBigFive5broadKey.htm |accessdate=6 March 2019}} they can be formatted into questionnaires.{{cite web |title=Administering IPIP Measures, with a 50-item Sample Questionnaire |url=https://ipip.ori.org/New_IPIP-50-item-scale.htm |accessdate=6 March 2019}}

Many broad-bandwidth personality inventories (e.g., MMPI, NEO-PI) are proprietary. As a result, researchers cannot freely deploy those instruments and, thus, cannot contribute to further instrument development.[Rationale for the IPIP https://web.archive.org/web/20050313001046/http://ipip.ori.org/newRationale.htm] An additional problem is that these proprietary instruments are rarely revised, with some having items that are dated. One purpose of IPIP is to remedy that situation.

The IPIP website does not provide any tests formatted for administration. However, websites that use the IPIP inventories for testing are available:

• IPIP-NEO-120 is an IPIP version of the NEO-PI-R test.{{cite web |last1=Johnson |first1=John A. |title=IPIP NEO-PI, Introductory Information |url=http://personal.psu.edu/~j5j/IPIP/ |accessdate=6 March 2019}} The site is hosted by John A. Johnson, the author of the shorter equivalent inventory.{{cite journal |last1=Johnson |first1=John A. |title=Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120 |journal=Journal of Research in Personality |date=August 2014 |volume=51 |pages=78–89 |doi=10.1016/j.jrp.2014.05.003}} The longer equivalent from 1999 was created by Lewis Goldberg who also created IPIP.{{cite journal|url=https://ipip.ori.org/A%20broad-bandwidth%20inventory.pdf|author1=Lewis R. Goldberg|year=1999|title=A broad-bandwidth, public domain, personality inventory measuring the lower-level facets of several five-factor models |editor1=Mervielde, I. |editor2=Deary, I. |editor3=De Fruyt, F. |editor4=Ostendorf, F.|journal=Personality Psychology in Europe|volume=7|pages=7–28}}
• Open Source Psychometrics Project hosts Goldberg's 50-question version{{cite journal |last1=Goldberg |first1=Lewis R. |title=The development of markers for the Big-Five factor structure. |journal=Psychological Assessment |date=1992 |volume=4 |issue=1 |pages=26–42 |doi=10.1037/1040-3590.4.1.26}} of the Big Five traits and an IPIP emulation of the 16PF questionnaire.{{cite web |title=Take a personality test - Open Source Psychometrics Project |url=https://openpsychometrics.org/ |accessdate=6 March 2019}}