Vol. 24 Num. 3 (2004) Laurinda Brown , Brent Davis Talking about Bateson: that which matters2 Margaret Walshaw A powerful theory of active engagement4 Margot Berger Heaps, complexes and concepts (part 2)11 Barry Mazur On the absence of time in mathematics18 Alf Coles Communication: Bateson stories: reflections from a classroom21 Thomas Kieren Communication: Mathematics knowing as fully embodied23 Fulvia Furinghetti Communication: Lost and found in ICME-1024 Abraham Arcavi Communication: Solving linear equations - why, how and when?25 Barbara Dougherty Communication: Early algebra: perspectives and assumptions28 Istvan Lenart Communication: What is wrong with the teaching of algebra?30 Bob Speiser , Chuck Walter Remembering Stanley Erlwanger33 Bob Speiser , Chuck Walter , Tara Lewis Talking through a method40