: Chavez, E.; Ide, R.; Kirste, T.

Abstract
Ultraportable mobile computers provide electronic assistance for environments and usage situations, where computer support up to now has not been feasible. For the first time, a true physical and cognitive integration of computer support into the everyday business of the real-world becomes possible, as envisioned in Mark Weiser's concept of "ubiquitous computing" However, although Handheld-PC etc. todayalready support a good deal of personal information management and basic access to distributed multimedia information services such as the World-Wide-Web, they are still surprisingly difficult to use in "full Action". Specifically, lenghty interaction sequences and the inability to find quickly that important piece of information which is embedded somewhere in the machine, makes using those devices sometimes a very disappointing experience Inthis paper, we outline a new approach to realizing an easy-to-usse personal digital assistant system, based on the concept of Situation Awareness. U sing knowledge about task structures, situation dependencies, and task contexts,our concept allows a mobile assistant to proactively provide the right information at the right time and the right place, without intruding upon the users primary task: interacting with reality.