Instructional quality is considered to be an important classroom variable, as it is significantly related to student achievement and motivation in mathematics. Existing studies in educational effectiveness furthermore identified a positive relation between instructional quality and school climate, suggesting that the school environment plays a significant role in teachers’ instructional practices. In order to bring together these two core findings, the relations among different aspects of school climate, instructional quality, and students’ achievement motivation for the TIMSS 2011 grade eight mathematics data sets comprising 50 countries are investigated. In particular, the role of instructional quality as a potential mediator between school climate and student motivation is examined, thereby focusing on three aspects of school climate (emphasis on academic success, safety, and order in schools) and three aspects of achievement motivation (self-concept, intrinsic value, and extrinsic value). In general, there was a significant positive relation between instructional quality and achievement motivation at the classroom level in mathematics; in some countries, a partial mediation of instructional quality between school climate and achievement motivation was apparent. Four main patterns of relations occurred. These findings are discussed with respect to implications for educational effectiveness research.
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