Abstract: We first analyzed the constitute factor of command space and built up a structure framework for multimodal interaction. On the basis of the CTT model, we put forward the extend-CTT task model representation methodology and carried out an in-depth analysis of the command space. Finally, based on the research aboved, we designed and implemented a multimodal intelligence discussion prototype system-MTTDS, which verified the theory presented in this paper.

Key words: Command space,Multimodal,Mask analysis,Extend-CTT,MTIDS