In-Car Multi-Domain Spoken Dialogs: A Wizard of Oz Study

Mobile Internet access via smartphones puts demands on in-car infotainment systems, as more and more drivers like to access the Internet while driving. Spoken dialog systems support the user by less distracting interaction than visual/hapticbased dialog systems. To develop an intuitive and usable spoken dialog system, an extensive analysis of the interaction concept is necessary. We conducted a Wizard of Oz study to investigate how users will carry out tasks which involve multiple applications in a speech-only, user-initiative infotainment system while driving. Results show that users are not aware of different applications and use anaphoric expressions in task switches. Speaking styles vary and depend on type of task and dialog state. Users interact efficiently and provide multiple semantic concepts in one utterance. This sets high demands for future spoken dialog systems.