As sensors become ever more prevalent, more and more information will be
collected about each of us. A long-term research question is how best to
support beneficial analysis of such data while preserving individual privacy.
Awareness systems represent an emerging class of applications supporting both
business and social functions that leverage pervasive sensors to detect and
report end-user physical state, activities, and available communication
channels. To buy into the system, however, users must be able to control how
information about them is shared.