Catherine Sophian was a Professor Emerita with the Department of Psychology, University of Hawaii at M?noa. Catherine did research in Developmental Psychology. She is now retired.

• Preface -- Perspectives on Number Development -- What’s in a Number? -- Numbers and Cognitive Development -- Numbers in School -- Developing Numerical Abilities -- Making Numbers Count -- The Sum of the Parts -- The Trouble with Fractions -- Conclusions -- Children’s Numbers: Toward a Synthesis