%0 Journal Article %T Analyzing Measurement Invariance of the Students¡¯ Engagement Instrument Brief Version: The Cases of Denmark, Finland, and Portugal %A H. Andersson %A H. Ulvseth %A M. Kuorelahti %A P. Moreira %A S. Tetler %A T. E. Virtanen %J Canadian Journal of School Psychology %@ 2154-3984 %D 2018 %R 10.1177/0829573517699333 %X The promotion of students¡¯ engagement with school is an internationally acknowledged challenge in education. There is a need to examine the structure of the concept of student engagement and to discover the best practices for fostering it across societies. That is why the cross-cultural invariance testing of students¡¯ engagement measures is highly needed. This study aimed, first, to find the reduced set of theoretically valid items to represent students¡¯ affective and cognitive engagement forming the Brief-SEI (brief version of the Student Engagement Instrument; SEI). The second aim was to test the measurement invariance of the Brief-SEI across three countries (Denmark, Finland, and Portugal). A total of 4,437 seventh-grade students completed the SEI questionnaires in the three countries. The analyses revealed that of the total 33 original instrument items, 15 items indicated acceptable psychometric properties of the Brief-SEI. With these 15 items, cross-national factorial validity and invariances across genders and students with different levels of academic performance (samples from Finland and Portugal) were demonstrated. This article discusses the utility of the Brief-SEI in cross-cultural research and its applicability in different national school contexts %K supporting students¡¯ engagement with school %K cross-cultural student engagement research %K Student Engagement Instrument %K measurement invariance %U https://journals.sagepub.com/doi/full/10.1177/0829573517699333