The design of a navigation system of a powered wheelchair
has been developed taking into account the conceptual framework
described in the previous section and in particular the
criteria of usability, acceptability, efficiency, security and costs.
For the definitions and metrics of such terms we referred to the
results of the European Project USER [23] coordinated within
the TIDE initiative. In particular, we used information and
guidelines on how to improve the design of assistive technology
products contained in the USERfit Hand-book [24].
The usability criterion was pursued by designing the