This book constiutes the reviewed proceedings of the 4th International Conference on Cognitive Technology, CT 2001, helds in Warwick, UK in August 2001. The 36 revised full papers presented together with six invited papers were carefully reviewed and selected for inclusion in the book. The book offers topical sections on designing artefacts, cognition in robotic and virtual environments, presence in virtual environments, human activity and humnan computing, computing and people education in cognition, learning, narrative and story-telling, interfaces, cognitive dimensions, human work and communities, and human-technology relationship.