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Sensing is best done close to the subject of interest. Instrumenting
a person is a better way to determine most aspects of her context than
instrumenting her environment. Placing sensors on the body makes the
wearer the natural focus and allows the application to "see" and
"hear" the environment from her point of view.
Body-worn sensors can provide functionality anywhere and any time, as
long as they are functioning and worn. However, sensing is nothing
without analysis, and the results must be accessible to the
context-aware application. To ensure this accessibility (and,
importantly, the privacy of the wearer) it makes sense to place the
processing, analysis, and application on the body as well as the
sensors, resulting in a single integrated context-aware system.
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