This essay is developed based on attempts to summarize the current state of speech and pen input technology and to identify its strengths, limitations and lastly, report on the key multimodal research challenge.
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"As applications generally become more complex, a single modality does not permit the user to interact affectively across all tasks and environments. A multi-modal interface offers the user freedom to use a combination of modalities or to switch to a better-suited modality, depending on the specifics of the task environment." This essay is developed based on attempted to summarize the current state of speech and pen input technology and to identify its strengths, limitations and lastly, report on the key multimodal research challenge. Multimodal technology can be useful in many different environments such as multi-modal interaction for people with disabilities, multi-modal interaction for distributed applications, multimodal systems is emerging in which the user will be able to employ natural communication modalities, including voice, hand and pen-based gesture, eye-tracking, body-movement. Multimodality allows taking benefits in an optimal way of the human communication capacities. Multimodal interface aim at integrating several communication means in...

