1. Anticipating the landscape in the next three years

   • Robyn Jorgensen

   Editorial Pages: 1 - 2

2. Voices from the field

   OriginalPaper Pages: 3 - 5

3. Learning from “Didactikids”: An impetus for revisiting the empty number line

   • Marja van den Heuvel-Panhuizen

   Articles Pages: 6 - 31

4. Transforming ethnomathematical ideas in western mathematics curriculum texts

   • Amelia Dickenson-Jones

   Articles Pages: 32 - 53

5. The co-development and interrelation of proof and authority: The case of Yana and Ronit

   • Michael N. Fried
   • Miriam Amit

   Articles Pages: 54 - 77

6. Principles of practice and teacher actions: Influences on effective teaching of numeracy

   • Tracey Muir

   Articles Pages: 78 - 101

7. Surveying the technology landscape: Teachers’ use of technology in secondary mathematics classrooms

   • Merrilyn Goos
   • Anne Bennison

   Articles Pages: 102 - 130

8. Reviewers for volume 20 of MERJ

   Announcement Pages: 131 - 131