We studied the usability of a Voice User Interface (VUI) that is consistent with a Graphical User Interface (GUI), and focused on its dependency with user age-groups. Usability tests were iteratively conducted on 245 Japanese subjects with age-groups from 20s to 60s using a prototype of an in-vehicle information application. Next we calculated and analyzed statistics of the usability tests. We discuss the differences in usability with respect to age-groups and how to handle them. We propose that it is necessary to make voice guidance straightforward and to devise a VUI consistent with a GUI (VGUI) in order to let users understand the system structure. Also we found that the default design of a VGUI should be as simple as possible so that elderly users, who may be slow to learn the new system structure, are able to easily learn it.
Bibliographic reference. Okamoto, Jun / Kato, Tomoyuki / Shozakai, Makoto (2009): "Usability study of VUI consistent with GUI focusing on age-groups", In INTERSPEECH-2009, 1839-1842.