Özet:

The aim of this study is to adapt Mindset Theory Scale (Yılmaz, 2022) into English. The participants of the study were 1154 middle school (senior year), high school and university students studying in a major city in the 2021-2022 academic year. Among these participants, 142 took part in testing the language validity of the scale, and 912 took part in the adaptation of the scale. The participants were chosen through simple random sampling. One hundred forty-two students, proficient in English and Turkish, filled the English and Turkish versions of the scale 20 days apart. The correlation between their scores in these versions were r= .963 (p < .01). The correlation coefficients for the relationships between scores of the dimensions and the subdimensions on the English and the Turkish versions of the scale were .876 for Procrastination, .910 for Effort, .944 for Belief in Improvement, .949 for Fixed Mindset and .945 for Growth Mindset. These results indicate that the English version of the scale is equivalent to the original Turkish version. The original structure of the scale was confirmed to exist in the English version. The results indicate that a hierarchical model for the English version of MTS has acceptable fitness values. The relationships between the subdimensions might indicate a good construct validity. Although the AVE value for the sub-dimension of MTS is between 0.44 and 0.50, if the CR value is above 0.70, it does not pose a problem in terms of convergent validity. Finally, the English version of MTS is a reliable and valid scale for measuring the Mindset Theories of students aged 14 and over. This scale, which was adapted to English to contribute to the scientific understanding of Mindset Theory and its relation to other concepts, can be used by teachers, guidance councillors and researchers.

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