The aim of this research was to adapt the Engagement Questionnaire in four dimensions (i.e. behavioral, emotional, cognitive, and agentic engagement) to Turkish to be used in science classes. For this purpose, firstly a pilot study was conducted with 153 middle school students, then the main study was conducted with 744 middle school students. Both studies supported four-factor structure of Turkish version of the EQ. In addition, reliabilities seemed to be sufficient. The results concerning the measurement invariance across gender revealed the data from both genders lead to equally valid conclusions regarding their engagement levels. Consequently, the findings of this study indicated that the Turkish version of EQ appears to be a valid and reliable instrument to measure and understand the middle school students engagement level in science classes.
Key words: Student Engagement; Validity; Reliability; Confirmatory Factor Analysis; Measurement Invariance across Gender
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