Vol. 24 Num. 1 (2004) Laurinda Brown Editorial2 Dick Tahta Who would I show it to3 Marta Civil , Nuria Planas Participation in the mathematics classroom: does every student have a voice?7 S. Philemon Ntenza Teachers' perceptions of the benefits of children writing in mathematical classrooms13 Richard Barwell Communication: What is numeracy?: a comment on Baker, Street, Tomlin 23(3)20 Bill Barton Communication: Mathematics and mathematical practices: where to draw the line?: a comment on Castro 23(3)22 Vicki Zack , David A. Reid Good-enough understanding: theorising about the learning of complex ideas (part 2)25 David Tall Building theories: the three worlds of mathematics: a comment on Inglis 23(3)29 Boris Koichu , Abraham Berman , Michael Moore Promotion of heuristic literacy in a regular mathematics classroom33 Alexander Karp Examining the interactions between mathematical content and pedagogical form: notes on the structure of the lesson40