This document contains seven papers (two written in English, the rest in German) on cognitive and non-cognitive variables in mathematics education. Abstracts of all seven articles are provided both in English and in German. The two English-written papers discuss individual differences that might influence the effectiveness of instruction in mathematics and research on some key non-cognitive variables in mathematics education. The remaining five papers cover the following topics: Individualization in mathematics instruction in grades 5 and 6--outline for the DIMO Project in the Federal Republic of Germany; dispositional variables for mathematics education; self-concept and self-esteem; cognitive styles and mathematics education; and mathematical abilities. (DT)