Vol. 15 Num. 3 (1995) Ruth Merttens Teaching not learning: Listening to parents and empowering children2 Julia Anghileri Language, arithmetic, and the negotiation of meaning10 Orit Zaslavsky Open-ended tasks as a trigger for mathematics teachers' professional development15 Marja Van Den Heuvel-Panhuizen , James A. Middleton , Leen Streefland Student-generated problems: Easy and difficult problems on percentage21 Luis Radford Before the other unknowns were invented: didactic inquiries on the methods and problems of mediaeval Italian algebra28 Rina Zazkis Fuzzy thinking in non-fuzzy situations: understanding students' perspective39 Gila Hanna Challenges to the importance of proof42