1. Early adolescents' proportional reasoning on ‘rate’ problems

   • Robert Karplus
   • Steven Pulos
   • Elizabeth K. Stage

   OriginalPaper Pages: 219 - 233

2. Students' understanding of differentiation

   • A. Orton

   OriginalPaper Pages: 235 - 250

3. Two methods for solving problems

   • Spyros P. Kalomitsines

   OriginalPaper Pages: 251 - 274

4. Spontaneous mathematization of situations outside mathematics

   • G. Trelinski

   OriginalPaper Pages: 275 - 284

5. The topological primacy thesis: Genetic and didactic aspects

   • Wilhelm Schipper

   OriginalPaper Pages: 285 - 296

6. Simplification and complexity in mathematics education

   • H. B. Griffiths

   OriginalPaper Pages: 297 - 317

7. Book Reviews

   • Richard Lesh
   • G. Walther

   BookReview Pages: 319 - 322

8. Announcement

   Announcement Pages: 323 - 323

9. Announcement

   Announcement Pages: 324 - 324