Wolff-Michael Roth is Lansdowne (endowed) Professor of Applied Cognitive Science at the University of Victoria. His interests are broad and concern science and science learning in formal (elementary school to university) and informal settings (community activists and research labs). He is the author of Authentic School Science and Designing Communities, and with K. Tobin and S. Ritchie, Re/constructing Elementary Science (Peter Lang, 2001).Kenneth Tobin is Professor of Education at the University of Pennsylvania. His main research is concerned with the improvement of teaching and learning in urban schools. Committed to «walking the walk,» he coteaches with resident teachers in inner city schools of Philadelphia. He has published numerous research articles and is co-author of Windows into Science (with J. B. Kahle & B. J. Fraser) and Re/constructing Elementary Science (Peter Lang, 2001).