When Intuition Beats Logic: Prospective Teachers’ Awareness of their Same Sides – Same Angles Solutions Pessia Tsamir Accounting for Students’ Schemes in the Development of a Graphical Process for Solving Polynomial Inequalities in Instrumented Activity Ferdinand D. Rivera Reconstruction of a Collaborative Mathematical Learning Process Monique Pijls, Rijkje Dekker and Bernadette Van Hout-Wolters Mathematics teachers’ beliefs about a new reform in high school geometry in Iran Zahra Gooya Triadic interaction in clinical task-based interviews with mathematics teachers Boris Koichu and Guershon Harel Situating graphs as workplace knowledge Richard Noss, Arthur Bakker, Celia Hoyles and Phillip Kent Book review Gail E. FitzSimons