INTERSPEECH 2006 - ICSLP
In this paper we examine the advantages of a system-initiative approach for the voice user interface of a driver information system (DIS). The problems of user-initiative systems are the steep learning curve and the high demand on memory to recall the correct voice commands. This is especially true in a car environment where the main, and most important task is to drive the car. In a Wizard of Oz experiment, we compared this approach to one that uses a more system-initiative form of interaction. Furthermore, a context sensitive help prompt was included in the new system, instead of just a context sensitive list of commands. The results show that, for novice users, the error rate, the number and time of task completion, the mental workload, and the subjective joy of use (as measured by a semantic differential) are all better for the proposed system. Nevertheless, the possibility to use shortcuts remains. Thus, an expert user could still skip the supermenus and jump into the given submenu by saying the right voice command.
Bibliographic reference. Ackermann, Chantal / Libossek, Marion (2006): "System- versus user-initiative dialog strategy for driver information systems", In INTERSPEECH-2006, paper 1172-Mon2FoP.3.