This paper surveys the current status of second generation HCI theory, faced with the challenges brought to HCI by the so-called third wave. In the third wave, the use context and application types are broadened, and intermixed, relative to the focus of the second wave on work. Technology spreads from the workplace to our homes and everyday lives and culture. Using these challenges the paper specifically addresses the topics of multiplicity, context, boundaries, experience and participation in order to discuss where second wave theory and conceptions can still be positioned to make a contribution as part of the maturing of our handling of the challenges brought on by the third wave.

<p>This dissertation discusses human-computer interaction, and the role of user interfaces in use and design from the point-of-view of human activity theory. Human-computer interaction conducted in purposeful human work is in focus. The main idea is that a computer application, from the user's perspective, is not something that the user operates on but something that the user operates through on other objects or subjects.</p><p>The contents of the report is the following: Danish Summary; Introduction; Human Activity and Human-Computer Interaction; User Interface Design -- the Empirical Cases; User Interfaces; Methods for User Interface Design; User Interface Design -- Advice to the Designer.</p>

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i m a g e b y u g g i k a l d a n c r e d i t t k Ekkomaten is an interactive installation that served as an interface with 18th century Aarhus, Denmark. The machine provides a soundscape where visitors can listen to different "echoes" from the past that have been "intercepted" by the machine.