In this article, we trace the development of Hatano's research, focusing on the core of his research interest, namely, expertise, conceptual development, and classroom learning. He held both Piagetian constructivist views and Vygotskian sociocultural perspectives in balance, and preferred to study human cognition executed in everyday life. This…

To bring out Giyoo Hatano's contributions to the understanding of culture and cognitive development, we note first his special style--thoughtful, inventive, and always focused on central issues and on combining theory with data--and then, for three areas, some of the conceptual advances he proposed. The areas have to do with ties between cognitive…