Inclusivity in the Classroom and International Achievement in Mathematics and Science: An Exploratory Study.

Purpose: Few studies have examined the role of inclusivity in international assessments of student achievement, such as the TIMSS (Trends in International Mathematics and Science Study). The current study examined how the inclusivity of students with disabilities at the classroom level across countries may be associated with achievement scores, thus affecting national rankings. Method: To achieve this purpose, TIMSS mathematics and science achievement data were utilized. Findings: Results revealed how national rankings may be adjusted after examining the role of inclusivity in the classroom while statistically controlling for national economic and well-being indicators. Limitations: In terms of international comparisons, a country's history and culture can be critical in understanding its educational system and how it relates to the observed outcomes. The variables that we included in this study are quantified indicators that may reflect only some facets of each country's education system and special education inclusivity. Practical Implications: This study provides an overview of the measurement issues of children with disabilities within schools from the international context of the TIMSS while exploring the impact of student participation on rankings. Social Implications: The current study provides an empirical investigation of how country rankings in international assessment can move according to sociopolitical decisions. Originality: The current study is the first of its kind to examine the impact of inclusivity in the classroom on country rankings in international assessments.