A catalyst for mobile and ubiquitous computing

We dedicate this first issue, "Reaching for Weiser\´s Vision," to Mark Weiser. We begin with his original 1991 article - reprinted in the print edition only - with the permission of Scientific American. We then present five invited articles by the AEICs and coauthors, each examining the state of the art in one of the five areas of pervasive computing mentioned earlier. Each article begins by crisply characterizing the relevance of its area to Weiser\´s vision. It then summarizes recent advances and asking if they suggest any refocusing of Weiser??s vision. Finally, the article looks out into the future and identifies the challenges ahead in its area. This issue also includes pieces in the four departments, each providing a thought-provoking report or perspective on an aspect of pervasive computing.