'… rich in data and conceptual analysis … admirable scholarship …' Mike Bonner, PsycCRITIQUES
'Yrjö Engeström has produced the kind of scholarly synthesis of research on teamwork in organizational settings that social scientists have been waiting for ever since the appearance of his classic prolegomenon, 'Learning by Expanding'. It is both comprehensive in its critical and illuminating treatment of competing lines of research and theory, clear and compelling in its treatment of the work of his research team, and stimulating in its thoughts about the future of work.' Michael Cole, University of California, San Diego