The book is a collection about cultural-historical activity theory as it has been developed and applied by Yrjo Engestrom. The work of Engestrom is both rooted in the legacy of Vygotsky and Leont ev and focuses on current research concerns that are related to learning and development in work practices. His publications cross various disciplines and develop intermediate theoretical tools to deal with empirical questions. In this volume, Engestrom s work is used as a springboard to reflect on the question of the use, appropriation, and further development of the classic heritage within activity...