This paper contextualises the position of speech input from a user-centred human factors perspective. It is presented as a position paper so that researchers and designers can consider the underlying and future factors of a people-orientated approach to speech input for virtual applications. A number of key areas are explored including: human factors for speech input; speech input for virtual applications; speech as a spare mode of interaction; user acceptance and uptake; incorporating speech in the development of virtual applications; and speech input as an interaction tool. Given the user-centred perspective of this paper, this paper does not set out to address issues associated with spoken dialogue technologies, dialogue, and dialogue management; recent work on conversational agents in virtual environments; or multimodal interaction. This paper places the focus more fundamentally within human factors by looking at the user first as a basis for developing usable virtual applications incorporating speech input rather than to review the current state of the art in interaction design. A particular point this paper makes, however, is that speech input should be designed and used as another interaction tool that users need to learn to use, rather than assuming it will offer a natural or intuitive interface.
Advanced multimodal interaction techniques and user interfaces for serious games and virtual environments
