Conservation-nonconservation / Curt Acredolo -- The acquisition and elaboration of the number word sequence / Karen C. Fuson, John Richards, and Diane J. Briars -- Children's concepts of chance and probability / Harry W. Hoemann and Bruce M. Ross -- The development of quantity concepts / Linda S. Siegel -- Culture and the development of numerical cognition / Geoffrey B. Saxe -- Children's concept learning as rule-sampling systems with Markovian properties / Charles J. Brainerd.