摘要: Activity theory -- a conceptual framework originally developed by Aleksei Leontiev has its roots in the socio-cultural tradition Russian psychology. The foundational concept of is human activity, which understood as purposeful, mediated, and transformative interaction between beings world. Since early 1990s, activity been visible landmark theoretical landscape Human-Computer Interaction (HCI). Along with some other frameworks, such distributed cognition phenomenology, it established itself leading post-cognitivist approach HCI design. In this book we discuss foundations contribution to research. After making case for briefly discussing field (Chapter One) introduce historical roots, main ideas, principles Two). that present in-depth analyses three issues consider special importance current developments design, namely: agency Three), experience Four), activity-centric computing Five). We conclude reflections on challenges prospects further development Six). Table Contents: Introduction: changing face / Basic concepts Agency Activity-centric