Vol. 32 Num. 2 (2012) Richard Barwell Editorial2 Anna Sfard Communication: Research problems in mathematics education revisited: new clothes - and no emperor3 Ole Skovsmose Communication: Research problems in mathematics education revisited: explosive problems in mathematics education5 Pete Wright The Math Wars: tensions in the development of school mathematics curricula ABSTRACT 7 Peter Appelbaum Mathematical practice as sculpture of utopia: models, ignorance, and the emancipated spectator ABSTRACT 14 George Gadanidis Why can't I be a mathematician? ABSTRACT 20 Elizabeth de Freitas The diagram as story: unfolding the event-structure of the mathematical diagram ABSTRACT 27 Maria G. Bartolini Bussi Communication: The perspectograph34 Martin A. Simon , Nicora Placa Reasoning about intensive quantities in whole-number multiplication? A possible basis for ratio understanding ABSTRACT 35 Jérôme Proulx , Jean-François Maheux Épistémologie et didactique des mathématiques : questions anciennes, nouvelles questions ABSTRACT 42 - Contributor affiliations and contact information48