Vol. 4 Num. 3 (1984) H. J. M. Bos Mathematics and its social context: a dialogue in the staff room with historical episodes2 Gerhard Walther Communication: Action proof vs. illuminating examples?10 Martin Cooper Communication: Unobtrusive influences on the learning of number sense13 Raffaella Borasi Some reflections on and criticisms of the principle of learning concepts by abstraction14 Caleb Gattegno Curriculum and epistemology - II19 Merlyn Behr , John Bernard , Diane Briars , George Bright , Judy Sowder , Ipke Wachsmuth Communication: Research problems in mathematics education - III a22 John Mason Communication: Research problems in mathematics education - III b23 David Tall Communication: Research problems in mathematics education - III c25 David Robitaille Communication: Research problems in mathematics education - III d26 Thomas Carpenter Communication: Research problems in mathematics education - III e27 William M. Brookes Communication: Research problems in mathematics education - III f28 Roland Stowasser , Trygve Breiteig An idea from Jakob Bernoulli for the teaching of algebra: a challenge for the interested pupil30