CD-ROM developed by Maarten Dolk and Catherine Twomey Fosnot Facilitator's Guide developed by Antonia Cameron, Sherrin B. Hersch, and Catherine Twomey Fosnot In their Young Mathematicians at Work series, Catherine Twomey Fosnot and Maarten Dolk described Mathematics in the City, an innovative project where teachers helped young children construct a deep understanding of number and in a math workshop environment. Now they and two colleagues from the...