The Teacher Education Study in Mathematics or TEDS-M is a study conducted under the aegis of the International Association for the Evaluation of Educational Achievement (IEA). The lead research center for the study is the International Study Center at Michigan State University (ISC/MSU). The ISC/MSU worked from 2006 to 2011 with the International Study Center at the Australian Council for Educational Research (ACER) and the National Research Coordinators (NRCs) in 17 countries to produce this study. TEDS-M received funding from IEA, the United States of America National Science Foundation, and the collaborating countries. TEDS-M focused on how teachers are prepared to teach mathematics in primary and lower-secondary school, and studied the variation in the nature and impact of teacher education programs within and across countries. TEDS-M is the first cross-national study to provide data on the knowledge that future primary and lower-secondary school teachers have acquired in their mathematics teacher education. The key research questions for the study focused on the relationships between teacher education policies, institutional practices, and future teacher mathematics and pedagogy knowledge. Individual chapters contain figure, tables, footnotes and references. [For related reports, see "TEDS-M 2008 User Guide for the International Database. Supplement 1: International Version of the TEDS-M Questionnaires" (ED542382), "TEDS-M 2008 User Guide for the International Database. Supplement 2: National Adaptations of the TEDS-M Questionnaires" (ED542381), "TEDS-M 2008 User Guide for the International Database. Supplement 3: Variables Derived from the Educator and Future Teacher Data" (ED542385), and "TEDS-M 2008 User Guide for the International Database. Supplement 4: TEDS-M Released Mathematics and Mathematics Pedagogy Knowledge Assessment Items" (ED542384).] [This paper was edited with Maria Teresa Tatto. Contributors include Alena Becker, Ralph Carstens, Jean Dumais, Sabine Meinck, Plamen Mirazchiyski.]