Modality (human–computer Interaction)
- a sense through which the human can receive the output of the computer (for example, vision modality)
- a sensor or device through which the computer can receive the input from the human
In less formal terms, a modality is a path of communication between the human and the computer.
When multiple modalities are available for some tasks or parts of tasks, the system is said to have overlapping modalities. When multiple modalities are available for all tasks, the system is said to have redundant modalities.
Having too many modalities for a particular task is not a smart idea, however if you do not have enough modalities that will not be good as well.
Other related articles:
... The computer can be equipped with various types of input devices and sensors to allow it to receive information from the human. ...