Book excerpt: The central unifying theme of this state-of-the-art contribution to research on literacy is its rethinking and reconceptualization of individual differences in reading. Previous research, focused on cognitive components of reading, signaled the need for ongoing work to identify relevant individual differences in reading, to determine the relationship(s) of individual differences to reading development, and to account for interactions among individual differences. Addressing developments in each of these areas, this volume also describes affective individual differences, and the environments in.