TY - JOUR A1 - Dumont, Hanna A1 - Neumann, Marko A1 - Maaz, Kai A1 - Trautwein, Ulrich T1 - The effect of student body composition on academic achievement International and National Evidence JF - Psychologie in Erziehung und Unterricht : Zeitschrift für Forschung und Praxis N2 - This paper reviews empirical evidence on the effect of the composition of a student body on academic achievement of students. After defining the term composition effect, methodological aspects regarding the study of composition effects are considered. International and national evidence for the composition of a student body with respect to students' abilities, social, and ethnic background is then presented. Whereas international studies find evidence for social, ethnic, and achievement composition variables, national studies reveal that mean achievement level of a school or class is the most important composition variable in Germany. However, this effect is confounded with school track and social composition, which itself exerts a small incremental effect. Ethnic composition, however, does not seem to play an important role. The paper closes with a presentation of the underlying processes of composition effects and a discussion on how the composition of a student body is considered in school governance practices. KW - Composition effects KW - academic achievement KW - tracking Y1 - 2013 U6 - https://doi.org/10.2378/peu2013.art14d SN - 0342-183X VL - 60 IS - 3 SP - 163 EP - 183 PB - Reinhardt CY - München ER -