1. The changing of the guard—Again

   • Michael C. Mitchelmore

   Editorial Pages: 71 - 73

2. Calculus students’ ability to solve geometric related-rates problems

   • Tami Martin

   Articles Pages: 74 - 91

3. Concrete and formal arguments: The case of division by zero

   • Pessia Tsamir
   • Ruth Sheffer

   Articles Pages: 92 - 106

4. Linear geometric number patterns: Middle school students’ strategies

   • Joyee Bishop

   Articles Pages: 107 - 126

5. The role of collecting in the growth of mathematical understanding

   • Susan Pirie
   • Lyndon Martin

   Articles Pages: 127 - 146

6. Development of the concept of statistical variation: An exploratory study

   • Rob Torok
   • Jane Watson

   Articles Pages: 147 - 169

7. A tantalising journey

   • Kay Owens

   Book Review Pages: 170 - 172