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.

This essay 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.

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….(short extract)