Introduction -- The acquisition of addition and subtraction concepts / Thomas P. Carpenter and James M. Moser -- Proportional reasoning of early adolescents / Robert Karplus, Steven Pulos, and Elizabeth K. Stage -- Rational number concepts / Merlyn J. Behr ... et al. -- Multiplicative structures / Gerard Vergnaud -- Space and geometry / Alan J. Bishop -- Van Hiele based research / Alan Hoffer -- Trends and issues in mathematical problem solving research / Frank K. Lester -- Conceptual models and applied mathematical problem solving research / Richard Lesh, Marsha Landau, and Eric Hamilton -- Episodes and executive decisions in mathematical problem solving / Alan H. Schoenfeld.
