1. Establishing a custom of proving in american school geometry: evolution of the two-column proof in the early twentieth century

   • Patricio G. Herbst

   OriginalPaper 01 March 2002 Pages: 283 - 312

2. Structuring Occasions

   • Jo Towers
   • Brent Davis

   OriginalPaper 01 March 2002 Pages: 313 - 340

3. The balance model: Hindrance or support for the solving of linear equations with one unknown

   • Joëlle Vlassis

   OriginalPaper 01 March 2002 Pages: 341 - 359

4. A Matter of Time: Emotional Responses to Timed Mathematics Tests

   • Sharon B. Walen
   • Steven R. Williams

   OriginalPaper 01 March 2002 Pages: 361 - 378

5. Generalization of patterns: the tension between algebraic thinking and algebraic notation

   • Rina Zazkis
   • Peter Liljedahl

   OriginalPaper 01 March 2002 Pages: 379 - 402

6. Contents of Volume 49

   Volume Contents 01 March 2002 Pages: 403 - 404