1. Programming in Polygon R&D: Explorations with a Spatial Language II

   • Jim Morey

   Original Paper 02 August 2006 Pages: 147 - 175

2. A coloured window on pre-service teachers’ conceptions of rational numbers

   • Nathalie Sinclair
   • Peter Liljedahl
   • Rina Zazkis

   OriginalPaper 12 September 2006 Pages: 177 - 203

3. The Co-Emergence of Machine Techniques, Paper-and-Pencil Techniques, and Theoretical Reflection: A Study of Cas use in Secondary School Algebra

   • Carolyn Kieran
   • Paul Drijvers

   OriginalPaper 23 August 2006 Pages: 205 - 263

4. Icmi awards the 2005 felix klein and hans freudenthal medals

   Announcement 12 September 2006 Pages: 265 - 270