DG03: PARTICIPATION, THOUGHT AND LANGUAGE IN THE CONTEXT OF MATHEMATICS EDUCATION (2(ND) YEAR) - Rocha Falcao, Jorge Tarcisio da; Frade, Cristina; Lins, Romulo [UNESP]; Meira, Luciano; Winbourne, Peter; Novotna, J.; Moraova, H.; Kratka, M.; Stehlikova, N. (Int Grp Psychol Math Educ, 2006)