Book excerpt: Cognitive Development from a Strategy Perspective recognises the outstanding scientific legacy of Robert S. Siegler as a pioneer of modern research on cognitive development throughout the lifespan. This volume presents a collection of essays written by leading scholars in the field, using cutting-edge research to illustrate how Siegler’s work and ideas lay the groundwork for much of the modern studies on cognitive development. The collection includes chapters which examine strategic aspects of lifespan cognitive development, change mechanisms underlying cognitive development, and numeracy acquisition with emphasis given to the application of new strategies for education. It explores conceptual and methodological frameworks to best study and understand development during childhood and adulthood, and the role of foundational core knowledge on development and acquisition. These foundational issues are examined from various angles and finally integrated in a concluding panoramic chapter written by Siegler himself. Cognitive Development from a Strategy Perspective offers valuable reading for graduates and researchers in cognitive development and mathematical cognition, as well as those at the interface of psychology and education.