We know very little about social participation following the use of an assistive technology, and nothing regarding a device designed to facilitate face-to-face communication between hearing persons and deaf people who use sign language, and cannot speak and write. A pilot on evaluating social participation following the use of a new assistive technology is proposed. Fifteen deaf adults completed a three-month field study, with pre and post intervention measures. Three standardized instruments (LIFE-H, FACS, QUEST) were adapted for sign language interpretation and pretested. One month into the study, all participants had used the AT in 40% of ADL and 33% of social roles. AT use in life habits subsequently declined. The results for social participation showed only one significant improvement (p=0.026) after one month of AT use: the item concerning conversation with a hearing person. For functional communication, we found a significant improvement after 8 (p=0.016) and 12 weeks (p=0.012) for “social communication” only. The users were “neither dissatisfied nor satisfied” with the AT. Effectiveness, ease of use and follow-up services are considered critical. Methodological and technical improvements are suggested for researchers, developers, promoters and clinicians.