Psychologist Carol Dweck created the 3-item Growth Mindset Scale to measure how much people believe that they can get smarter if they work at it. The scale is freely available.
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Growth Mindset
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Aronson, J., Fried, C. B., & Good, C. (2002). Reducing the effects of stereotype threat on African American college students by shaping theories of intelligence. Journal of Experimental Social Psychology, 38, 113-125. https://doi.org/10.1006/jesp.2001.1491
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