Introduction - the systems approach to understanding technological change, Jane Ummerton. Part 1 Combining old and new technologies to reshape systems: recombining large technical systems - the case of European organ transplantation, Ingo Braun and Bernward Joerges changing embedded systems - the economics and politics of innovation in American railroad signalling, 1876-1914, Steven W. Usselman integrating supple technologies into utility power systems - possibilities for reconfiguration, Alexandra Suchard the normal accident of July 1914, Arden Bucholz. Part 2 Crossing borders reconfigures systems: transformation through integration - the unification of German telecommunications, Tobias Robischon multinationals in transition - global technical integration and the role of corporate telecommunication networks, Volker Schneider the Australian electric power industry and the politics of radical reconfiguration, Stephen M. Salsbury economics of changing grid systems - competition in the electricity supply industry, Olivier Coutard. Part 3 Confronting incompatibilities between changing systems and their cultures: the Internet challenge - conflict and compromise in computer networking, Jane Abbate broken plowshare - system failure and the nuclear power industry, Gene I. Rochlin. Part 4 Controlling the car - will the system change?: car traffic at the crossroads - new technologies for cars, traffic systems and their interaction, Reiner Grundmann rethinking road traffic as social interaction, Oskar Juhlin. Part 5 The logic of systemic technology: four notes on systemic technology, Svante Beckman. Part 6 Concluding comments: conclusion, Jane Summerton.