The purpose of this study is to develop a valid and reliable measurement tool to determine the motivation of middle school students towards grammar. The study group consists of a total of 500 7th-grade students, including 264 girls and 236 boys, studying in various middle schools in the city center of Kars. Exploratory factor analysis (EFA) was initially conducted on the data collected to determine the factorial structure and validity study of the scale. As a result of the factor analysis, it was observed that the scale has a twofactor structure. Therefore, the scale data were limited to two factors and analyzed using the principal components method. The Kaiser-Meyer-Olkin (KMO) statistic value of the scale was found to be 0.919, and the Bartlett's Test of Sphericity statistic value was χ2=6310.22; df=1081, p=0.000, indicating that it was significant and suitable for factor analysis. Item-total test correlations were calculated as evidence of item validity. It was determined that the item-test correlations ranged from 0.308 to 0.710. The Cronbach's alpha internal consistency coefficient calculated to determine the reliability of the scale was found to be 0.948 for the total scale. The internal consistency coefficient of the high motivation factor of the scale was found to be 0.946, and the internal consistency coefficient of the low motivation factor was found to be 0.874, indicating high internal consistency. In light of these findings, it was concluded that the grammar motivation scale is valid and reliable.

Grammar, motivation, scale development, validity, reliability.