Using the extension of the national PISA 2003 sample (PISA 2003-E) of 15-year-old students, this study analyzes assimilation patterns of immigrants from Turkey, the former USSR, and Poland in terms of educational attainment and performance in mathematics. It explores the extent to which segmented assimilation processes are observed for these groups. Increasing similarity of immigrant students across generations with native students on these dimensions would support the notion of straight-line assimilation, whereas stability in disparities would point to downward assimilation. The results of the study suggest downward assimilation for immigrant students of Turkish descent regarding educational attainment and performance in mathematics. Students whose families immigrated from the former USSR or Poland, in contrast, show patterns of straight-line assimilation. In addition, our analyses suggest that capturing immigrant status as precisely as possible (1.5 generation, intermarriage) is important, as significant differences in educational success and living conditions of these groups would otherwise be overlooked. © VS-Verlag 2010.

Assimilation achievement Generation Migration 1.5 Generation Intermarriage

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