Vol. 23 Num. 1 (2003) Patricio Herbst , Daniel Chazan Exploring the practical rationality of mathematics teaching through conversations about videotaped episodes: the case of engaging students in proving2 Melissa Rodd Witness as participation: the lecture theatre as a site for mathematical awe and wonder15 Yuichi Handa A phenomenological exploration of mathematical engagement: approaching an old metaphor anew22 José M Chamoso Sanchez Considering dialogue as a social instrument in the mathematics class30 Philip J. Davis Communication: Mathematics is not required41 Larry Copes Communication: Problems in the real world of mathematics education43 Bruno D'Amore La complexité de la noétique en mathématiques ou les raisons de la dévolution manquée47