Vol. 25 Num. 2 (2005) Marja Van Den Heuvel-Panhuizen The role of contexts in assessment problems in mathematics2 Signe E. Kastberg ,  Beatriz D'Ambrosio ,  George McDermott ,  Nivan Saada Context matters in assessing students' mathematical power10 Francine Roy ,  Celia Rousseau Student thinking as a context for high expectations16 David A. Reid ,  Matthew Inglis Talking about logic24 Bruno D'Amore Secondary school students' mathematical argumentation and Indian logic (nyaya)26 David A. Reid Communication: Juxtapositions33 Tim Fukawa-Connelly Communication: Thoughts on learning advanced mathematics33 Morten Misfeldt Media in mathematical writing: can teaching learn from research practice?36 Abraham Arcavi Developing and using symbol sense in mathematics42