The situations in which human-computer interaction takes place are increasingly varied, as computers become highly portable and embedded in everyday environments. Research reported from different communities (Wearable Computing, Mobile Computing, HCI, CSCW, Augmented Reality) indicates that awareness of situations can lead to improvement of human-computer interaction. We propose a workshop at CHI2000 to provide a forum to discuss situational awareness and situated interaction. With the availability of sensing technologies, such as measuring the surrounding light conditions, the motion of the user, the orientation of a display, users' position relative to an information appliance, the number of users in front of a device, users' emotional state (bio-sensors), etc., this situational context can be captured and used as additional input to the system. The interaction process can benefit from the additional knowledge about the situation [1].@en