Workshop 1: The Internet as Critical Infrastructure: socio-technical issues Organisers: Heiko Niedermeyer, Georg Carle, David Hutchison, Jerry Busby and Mark Rouncefield. This half-day workshop has developed out of some shared interests in the EU funded Internet Science network of excellence, in particular JRA7 ‘Internet as a Critical Infrastructure: Security, Resilience and Dependability Aspects’. As the Internet replaces specially deployed data networks to become the carrier for an increasing number of critical applications – such as financial data transactions or security operations – the impact of failures in its operation can become dramatic. Essentially, the Internet has become a critical infrastructure, though it was not designed for this purpose. It is therefore imperative that we engage in a systematic approach to address risk and resilience to random failures, human errors, software or hardware faults, as well as political decisions and orchestrated malicious attacks at a broader socio- technical level, jointly investigating how threats arise, and how resilience and dependability can be provisioned. This approach will combine social actors using and operating critical applications on the Internet with work on the security and resilience of the Internet itself. The EINS working group aims to integrate technical, economical, sociological, political and legal viewpoints and expertise in addressing the criticality of the Internet infrastructure and the challenges that may arise from usage patterns, technical faults, local political decisions or malicious attackers. As such we believe it should prove of interest to a number of COOP participants – as well as those with broad interests in CSCW and HCI. The focus and theme of this workshop is specifically on the socio-technical aspects of the Internet as a Critical Infrastructure.