Vol. 1 Num. 2 (1981) David Wheeler Editorial2 William Higginson On the foundations of mathematics education3 John Mason When is a symbol symbolic?8 Hans Freudenthal Four-cube houses12 Jens Holger Lorenz Teacher-student interactions in the mathematics classroom: a review14 Leone Burton Problems and puzzles20 Lawrence Kucharz City street scenes II23 Caleb Gattegno Letter to the Editor24 David Tall The anatomy of a discovery in mathematics research25 Peggy Marchi Can heuristic be taught?35 David Hawkins The view from below43