Vol. 25 Num. 3 (2005) Signe E. Kastberg Seeing the construction of a multiplicative world2 Laurent Theis L'apprentissage du signe = : un obstacle cognitif important ABSTRACT 7 Laurent Theis Learning the = sign: a significant cognitive obstacle (online only) ABSTRACT 12 Younggi Choi , Jonghoon Do Equality involved in 0.999... and (-8)^1/313 Janelle McFeetors , Ralph Mason Voice and success in non-academic mathematics courses:(re)forming identity16 Maria Dolores Lozano Mathematics learning: ideas from neuroscience and the enactivist approach to cognition24 Thomas Falkenberg Communication: Caring in the teaching and learning of mathematics: a comment on Hackenberg 25(1)28 Amy Hackenberg Communication: A response to Falkenberg29 Keith Weber Communication: On logical thinking in mathematics classrooms30 Barbara Ball , Alf Coles , Dave Hewitt , Dave Wilson , Laurie Jacques , Kath Cross , Dick Tahta , Laurinda Brown , Gill Hatch , Pete Griffin Talking about subject-specific pedagogy32 Michal Yerushalmy Challenging known transitions: learning and teaching algebra with technology37 Alexander Khait A unified approach to mathematics education created around the computer paradigm43