Presentation held at the International Conference "ICT that makes the difference", Brussels, November 22-25, 2009

Abstract
In ubiquitous environments computers disappear and users are supported to concentrate on the tasks they actually in- tend to perform without having to focus on how the required devices are to be operated and connected. In our point of view, this vision on the one hand further encourages the miniaturization of devices and new design concepts. On the other hand, however, it also implies some disadvantages. In ubiquitous environments it is not really clear to the user which objects possess special capabilities. They also do not easily reveal their spectrum of functionalities. This work discusses three different approaches to interac- tion metaphors for smart environments based on scenarios. Currently, this happens on a conceptual level by presenting first scenarios.