Abstract
The main object of assistive devices for people with disabilities is to decrease the barriers in his/her activities and to increase their daily activities. Some of these assistive devices, in real situations, can not provide full of the functions that the designers intended. In this paper we focus matching between user's intention and the functions of devices. The basic idea of our study is ; there exists large individual differences among target users, and the relation between a user and a device is dynamically changes due to various environmental factors including carers. We point out certain design approach that decreases the gap between users and devices.
