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{{distinguish|Mode (computer interface)}}
In the context of [[human–computer interaction]], a '''modality''' is the classification of a single independent channel of sensory [[input/output]] between a computer and a human.<ref name="HCI Overview2">{{cite journal|last1 = Karray|first1 = Fakhreddine|last2 = Alemzadeh|first2 = Milad|last3 = Saleh|first3 = Jamil Abou|last4 = Arab|first4 = Mo Nours|title = Human-Computer Interaction: Overview on State of the Art|journal = International Journal on Smart Sensing and Intelligent Systems|date = March 2008|volume = 1|issue = 1|url = http://www.s2is.org/issues/v1/n1/papers/paper9.pdf|accessdate = April 21, 2015}}</ref>
A system is designated unimodel if it has only one modality implemented, and multimodel if it has more than one.<ref name="HCI Overview2" /> When multiple modalities are available for some tasks or aspects of a task, the system is said to have overlapping modalities. If multiple modalities are available for a task, the system is said to have redundant modalities. Multiple modalities can be used in combination to provide
==Computer–Human Modalities==
Computers utilize a wide range of technologies to communicate and send information to humans:
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