Research in the area of mathematics education has flourished over the past two decades. The Handbook of Research on Mathematics Teaching and Learning is the most comprehensive and up-to-date survey of the best research, new developments, and critical conflicts and controversies in mathematics education. Sponsored by the National Council of Teachers of Mathematics and written by leading experts in the field of mathematics education, the Handbook is specifically designed to make important, vital scholarship accessible to mathematics education professors, graduate students, educational...