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Having multiple modalities in a system gives more [[affordance]] to users and can contribute to a more robust system. Having more also allows for greater [[accessibility]] for users who work more effectively with certain modalities. Multiple modalities can be used as backup when certain forms of communication are not possible. This is especially true in the case of redundant modalities in which two or more modalities are used to communicate the same information. Certain combinations of modalities can add to the expression of a computer-human or human-computer interaction because the modalities each may be more effective at expressing one form or aspect of information than others.
There are six types of cooperation between modalities, and they help define how a combination or fusion of modalities work together to convey information more effectively.<ref name=":0">{{Cite book|title = Multimodal Human Computer Interaction and Pervasive Services|last = Grifoni|first = Patrizia|publisher = IGI Global|year = 2009|isbn = 9781605663876|___location = |pages = 37|url = https://books.google.com/books?id=O8CqMtIKSWwC&source=gbs_navlinks_s}}</ref>
* '''Equivalence:''' information is presented in multiple ways and can be interpreted as the same information
* '''Specialization:''' when a specific kind of information is always processed through the same modality
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* '''Transfer: '''a modality produces information that another modality consumes
* '''Concurrency:''' multiple modalities take in separate information that is not merged
Complimentary-redundant systems are those which have multiple sensors to form one understanding or dataset, and the more effectively the information can be combined without duplicating data, the more effectively the modalities cooperate. Having multiple modalities for communication is common, particularly in smartphones, and often their implementations work together towards the same goal, for example gyroscopes and accelerometers working together to track movement.<ref name=":0">{{Cite book|title = Multimodal Human Computer Interaction and Pervasive Services|last = Grifoni|first = Patrizia|publisher = IGI Global|year = 2009|isbn = 9781605663876|___location = |pages = 37|url = https://books.google.com/books?id=O8CqMtIKSWwC&source=gbs_navlinks_s}}</ref>
==See also==
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