science teaching and learning among elementary and middle school children in different countries, including Japan, China, the Czech Republic, Netherlands, Switzerland, Australia, and the United States. Dr. Stigler is coauthor of The Teaching Gap: Best Ideas from the World’s Teachers for Improving Education in the Classroom (The Free Press, 1999). He received his Ph.D. in developmental psychology from the University of Michigan.

Kenneth I.Wolpin is a professor of economics at the University of Pennsylvania. His research focuses on life-cycle decision making. Dr. Wolpin serves on the National Research Council’s Board on Testing and Assessment. He received his Ph.D. in economics from the Graduate School of the City University of New York.

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