Previous work has already established the reliability and validity of the Grit scale, based on the classical test theory (Duckworth, Peterson, Matthews, & Kelly, 2007). This study tests the psychometric properties and the dimensionality of the scale by employing an IRT analysis of data collected from a Russian sample of 3383 15 year-old students (Study 1). The results showed that the Grit Scale is two-dimensional, but unlike the early results, both the Consistency of Interests and Perseverance of Effort subscales are quite separate measures for different traits. The construct validation (Study 2) included a retest of the obtained internal structure of the scale via CFA, and a determination of whether two subscales show reasonable patterns of correlations with external measures. Collectively, the data supports the reliability and the validity of both subscales as separate measures.JEL Classification: Z.

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