Vol. 24 Num. 2 (2004) Margot Berger Heaps, complexes and concepts (part I)2 Anna Sierpinska Research in mathematics education through a keyhole: task problematization7 David Pimm Communication: A case of you: remembering David Fowler16 Laurinda Brown Communication: From the editor17 Dave Baker , Brian Street Communication: Mathematics as social: a comment on Barwell 24(1)19 Istvan Lenart Sing mathematics together: thoughts on the future of a school subject22 Guy Claxton Mathematics and the mind gym: how subject teaching develops a learning mentality27 Barbara Brizuela , Analucia Schliemann Ten-year-old students solving linear equations33 Paul Dickinson , Frank Eade Using the number line to investigate solving linear equations41