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Multimodal interaction provides the user with multiple modes of interfacing with a system beyond the traditional keyboard and mouse input/output. The most common such interface combines a visual modality (e.g. a display, keyboard, and mouse) with a voice modality (speech recognition for input, speech synthesis and recorded audio for output). However other modalities, such as pen-based input or haptic input/output, may be used. Multimodal user interfaces are a research area in human-computer interaction. The advantage of multiple modalities is

Multimodal Interaction Should Degrade Gracefully Human interaction degrades gracefully; for example, a face-to-face conversation degrades gracefully in that it still remains effective when one of the participants in the conversation is functionally blind, e.g., when talking over a telephone. This form of graceful degradation is due to the high level of redundancy in human communication. As man-machine interfaces come to include multimodal interaction, we need to ensure that these interfaces degrade gracefully in a manner akin to human conversation.