Tabla de Contenidos: “….] -- Mathematics learning in the junior secondary school : students' access to significant mathematical ideas / Teresa Rojano -- Advanced mathematical thinking with a special reference to reflection on mathematical structure / Joanna Mamona-Downs and Martin Downs -- Representation in mathematical learning and problem solving / Gerald Goldin -- Teacher knowledge and understanding of students' mathematical learning / Ruhama Even and Dina Tirosh -- Developing mastery of natural language : approaches to theoretical aspects of mathematics / Paolo Boero, Nadia Douek, and Pier Luigi Ferrari -- Access and opportunity : the political and social context of mathematics education / William Tate and Celia Rousseau -- Democratic access to powerful mathematics in a developing country / Luis Moreno-Armella and David Block -- Mathematics learning in out-of-school contexts : a cultural psychology perspective / Guida de Abreu -- Research, reform, and times of change / Miriam Amit and Michael Fried -- Democratic access to powerful mathematical ideas / Ole Skovsmose and Paola Valero -- Relationships build reform : treating classroom research as emergent systems / James Middleton ... …”