Tilik

Licences and attribution

Every instrument lists its licence, its source, and the paper that describes it. Only instruments that are public domain, Creative Commons, or free with attribution can be included.

Anxiety screen (GAD-7)

FieldValue
LicencePublic domain
Licence notesThe GAD-7 is in the public domain. No permission is required to reproduce, translate, display, or distribute it.
CitationSpitzer, R. L., Kroenke, K., Williams, J. B. W., & Löwe, B. (2006). A brief measure for assessing generalized anxiety disorder: The GAD-7. Archives of Internal Medicine, 166(10), 1092-1097.
Sourcehttps://www.phqscreeners.com/
  • Spitzer, R. L., Kroenke, K., Williams, J. B. W., & Löwe, B. (2006). A brief measure for assessing generalized anxiety disorder: The GAD-7. Archives of Internal Medicine, 166(10), 1092-1097. doi:10.1001/archinte.166.10.1092
  • Pfizer (2026). Instructions for Patient Health Questionnaire (PHQ) and GAD-7 measures. https://archive.thepcc.org/sites/default/files/resources/instructions.pdf.

Big Five personality test (IPIP-NEO-120)

FieldValue
LicencePublic domain
Licence notesThe IPIP items are in the public domain. Copy, edit, translate, and use them for any purpose without permission and without a fee.
CitationJohnson, J. A. (2014). Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120. Journal of Research in Personality, 51, 78-89.
Sourcehttps://ipip.ori.org/30FacetNEO-PI-RItems.htm
  • Johnson, J. A. (2014). Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120. Journal of Research in Personality, 51, 78-89. doi:10.1016/j.jrp.2014.05.003
  • Goldberg, L. R. (1999). A broad-bandwidth, public domain, personality inventory measuring the lower-level facets of several five-factor models. Personality Psychology in Europe, 7, 7-28.
  • International Personality Item Pool (2026). IPIP item pool and scales. https://ipip.ori.org/.
  • International Personality Item Pool (2026). Information about Norms and Data Sets. https://ipip.ori.org/newNorms.htm.

Big Five short test (IPIP-50)

FieldValue
LicencePublic domain
Licence notesThe IPIP items are in the public domain. Copy, edit, translate, and use them for any purpose without permission and without a fee.
CitationGoldberg, L. R. (1992). The development of markers for the Big-Five factor structure. Psychological Assessment, 4(1), 26-42.
Sourcehttps://ipip.ori.org/New_IPIP-50-item-scale.htm
  • Goldberg, L. R. (1992). The development of markers for the Big-Five factor structure. Psychological Assessment, 4(1), 26-42. doi:10.1037/1040-3590.4.1.26
  • International Personality Item Pool (2026). Big-Five Factor Markers scoring key. https://ipip.ori.org/newBigFive5broadKey.htm.
  • International Personality Item Pool (2026). IPIP item pool and scales. https://ipip.ori.org/.

Depression screen (PHQ-9)

FieldValue
LicencePublic domain
Licence notesThe PHQ family, including the PHQ-9, is in the public domain. No permission is required to reproduce, translate, display, or distribute it.
CitationKroenke, K., Spitzer, R. L., & Williams, J. B. W. (2001). The PHQ-9: Validity of a brief depression severity measure. Journal of General Internal Medicine, 16(9), 606-613.
Sourcehttps://www.phqscreeners.com/
  • Kroenke, K., Spitzer, R. L., & Williams, J. B. W. (2001). The PHQ-9: Validity of a brief depression severity measure. Journal of General Internal Medicine, 16(9), 606-613. doi:10.1046/j.1525-1497.2001.016009606.x
  • Spitzer, R. L., Kroenke, K., Williams, J. B. W., & Löwe, B. (2006). A brief measure for assessing generalized anxiety disorder: The GAD-7. Archives of Internal Medicine, 166(10), 1092-1097. doi:10.1001/archinte.166.10.1092
  • Pfizer (2026). Instructions for Patient Health Questionnaire (PHQ) and GAD-7 measures. https://archive.thepcc.org/sites/default/files/resources/instructions.pdf.

Sixteen-factor personality test (IPIP)

FieldValue
LicencePublic domain
Licence notesThe IPIP items are in the public domain. Copy, edit, translate, and use them for any purpose without permission and without a fee.
CitationGoldberg, 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 University Press.
Sourcehttps://ipip.ori.org/new16PFKey.htm
  • 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 University Press.
  • International Personality Item Pool (2026). 16PF preliminary IPIP items and scoring key. https://ipip.ori.org/new16PFKey.htm.
  • International Personality Item Pool (2026). 16PF comparison table. https://ipip.ori.org/new16PFTable.htm.
  • International Personality Item Pool (2026). IPIP item pool and scales. https://ipip.ori.org/.

Reporting a problem

If an attribution is wrong or incomplete, open an issue at github.com/frsswq/tilik/issues. The item text, the scoring key, and the site code are public.

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