Proceedings of the Fourth Nordic Conference on Human-Computer Interaction (NordiCHI 2006)

NordiCHI is the main forum for human-computer interaction research in the Nordic countries. It is a biannual conference, and the three first conferences were held in Stockholm (2000), Arhus (2002) and Tampere (2004), respectively. This year's conference is held in Oslo and is hosted by the Norwegian Computing Society (NCS). It is a joint effort ("dugnad"), joining together a large portion of the Norwegian HCI community in academia, research and industry. Each fall for the last 8 years NCS has arranged a two-day conference on usability, user experience and documentation called Yggdrasil. NordiCHI incorporates this year's Yggdrasil conference. The most visible result of this is that NordiCHI 2006 has defined Industrial Experience Reports as a new contribution category.The main theme for this year's conference is "Changing roles". We currently see a reshaping of almost every aspect of society, which is caused by the forces of globalization and innovative uses of personal technologies in the networked society. Do we need to change our roles as developers, researchers and designers? How can we maintain focus on the user in this rapidly changing environment? Will the role of HCI change? The broad call for participation elicited excellent response in the HCI community, and we are happy to provide a high-quality technical program that combines the best of the Nordic tradition with emerging trends in interaction techniques and new approaches to study human-computer interaction.