Multimodal language processing

Multimodal interfaces enable more natural and effective humancomputer interaction by providing multiple channels through which input or output may pass. In order to realize their full potential, they need to support not just input from multiple modes, but synchronized integration of semantic content from different modes. This paper describes a multimodal language processing architecture which allows for declarative statement of multimodal integration strategies in a unification-based grammar formalism. The architecture is currently deployed in a working system enabling interaction with dynamic maps using speech and pen, but the approach is more general and supports a wide variety of other potential multimodal interfaces.