FrontMatter -- Preface -- Contents -- 1 Introduction -- Part II MATHEMATICS -- 5 Mathematical Understanding: An Introduction -- 6 Fostering the Development of Whole-Number Sense: Teaching Mathematics in the Primary Grades -- 7 Pipes, Tubes, and Beakers: New Approaches to Teaching the Rational-Number System -- 8 Teaching and Learning Functions -- A FINAL SYNTHESIS: REVISITING THE THREE LEARNING PRINCIPLES -- 13 Pulling Threads -- Biographical Sketches of Committee Members and Contributors -- Index.