Tabla de Contenidos: “…Hans-Georg Weigand, William McCallum, Marta Menghini, Michael Neubrand, Gert Schubring, Renate Tobies -- part 5: National presentations -- Argentinean National presentation, Esther Galina, Mónica Villarreal -- Teachers’ Professional Development and Mathematics Education in Brazil, Victor Giraldo -- Mathematics Education in Ireland, Maurice OReilly, Thérèse Dooley, Elizabeth Oldham, Gerry Shiel -- National presentation of Japan, Toshiakira Fujii, Yoshinori Shimizu, Hanako Senuma, Toshikazu Ikeda -- National presentation of Lower Mekong sub-region countries, Fidel R. …”