  The rise in life expectancy is one of the great achievements of the twentieth
century. This phenomenon originates a still increasing interest in Ambient
Assisted Living (AAL) technological solutions that may support people in their
daily routines allowing an independent and safe lifestyle as long as possible.
AAL systems generally acquire data from the field and reason on them and the
context to accomplish their tasks. Very often, AAL systems are vertical
solutions, thus making hard their reuse and adaptation to different domains
with respect to the ones for which they have been developed. In this paper we
propose an architectural solution that allows the acquisition level of an ALL
system to be easily built, configured, and extended without affecting the
reasoning level of the system. We experienced our proposal in a fall detection
system.
