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IQ & the International Cognitive Ability Resource Sample Test


Assessment name:  International Cognitive Ability Resource Sample Test (ICAR)

Scale overview: The International Cognitive Ability Resource Sample Test (ICAR-16) is a 16-item assessment of cognitive ability in four domains.

Authors: David Condon and William Revelle


Response Type: Items are rated on a scale of agreement from

Scale items

International Cognitive Ability Resource scale items are protected but available to registered users. The 16-items version includes 4-items per cognitive domain. Following are the 4 domains.

LN – Letter number Series

MR – Matrix Reasoning

VR – Verbal Reasoning

R3D – three-dimensional reasoning

Psychometric properties

Merz et al. (2022) reported a normal distribution of International Cognitive Ability Resource scale scores and positive correlations with level of education, income, and a self-estimate of intelligence. There were no gender differences on the total score.

Lace and Evans (2021) found an inverse correlation between spirituality and intelligence using the ASPIRES-SF and the ICARS-16 (r = -0.22 for ASPIRES-SF-R and -0.11 for ASPIRES-SF-S).

Lace and Evans (2021) also reported mean IQ scores using ICAR-16 for religious and nonreligious adults. Those who identified as only religious obtained the lowest intelligence scores. The total ICAR-16 intelligence scores are reported by category identity below. See Table 2 in their article for score details.

Religious = 92.99

Spiritual = 99.37

Religious & Spiritual = 98.86

Not religious or spiritual = 103.73

The effect size comparing Religious and Not religious = .73

 Other data may be found in Condon and Revelle (2014), Revelle et al. (2020), and Dworak et al. (2021).


Availability: The ICAR is available online at The Project - International Cognitive Ability Resource - The ICAR Project (

References for the scale

Condon, D. M., & Revelle, W. (2014). The international cognitive ability resource: Development and ini[1]tial validation of a public-domain measure. Intelligence, 43, 52–64. 2014.01.004

Dworak, E. M., Revelle, W., Doebler, P., & Condon, D. M. (2021). Using the International Cognitive Ability Resources as an open source tool to explore individual differences in cognitive ability. Peresonality and Individual Differences, 169(1), 109906.


Lace, John W., and Luke N. Evans. 2022. “The Relationship between Religiousness/Spirituality and Psychometric Intelligence in the United States.” Journal of Religion and Health 61 (6): 4516–34. doi:10.1007/s10943-021-01394-4.

Merz, Z. C., Lace, J. W., & Eisenstein, A. M. (2020). Examining broad intellectual abilities obtained within an MTurk internet sample. Current Psychology. Advance online publication. https://doi. org/10.1007/s12144-020-00741-0

Revelle, W., Dworak, E. M., & Condon, D. (2020). Cognitive ability in everyday life: The utility of open[1]source measures. Current Directions in Psychological Science, 29(4), 358–363. 1177/0963721420922178

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The information about scales and measures is provided for clinicians and researchers based on professional publications. The links to authors, materials, and references can change. You may be able to locate details by contacting the main author of the original article or another author on the article list.


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Geoffrey W. Sutton PhD is Emeritus Professor of Psychology who publishes book and articles about clinical and social psychology including the psychology of religion. Website:


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