Abstract
Objectives This study investigated the items and factor structure of grit of middle school students and analyzed the longitudinal change of grit sub-variables. Methods The researcher analyzed 2,338 middle school students’ responses from the Daegu Longitudinal Study data for three years (2017-2019) and implemented factor analysis and model’s goodness of fit through convergent validity and discriminant validity. The potential growth model was also explored. Results At all three years, the second factor of grit was valid. All grit sub-variables were non-linear and V-shaped. The statistical difference was confirmed in the variance of change rate. The researcher found a difference in the degree of change at all three years in persistence of effort and consistency of interest. Conclusions Based on a sharp decline in grit for 8th graders, educators need to implement curriculum restructure based on cooperation in school education. Also, the effectiveness of the free year program should be reexamined.
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