HCI: Matching devices with work
June 24, 2008
Depending on the task, any arbitrary chosen property of any input device can contribute an advantage in one situation, but a disadvantage in another. While selecting an input device it will be necessary then to:
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Take into account the particular transportations that would have to be earned out to perform required task.
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Try to set up natural mappings between the ways in which the device can be manipulated, the feedback given by the program and the meaning of the result in terms of the users’ mental model.
Matching devices with users
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input for the disabled
Computers can enable disabled people to communicate with others or undertake employment where this would otherwise be difficult or impossible e.g. eye and head movement input.
These are beneficial if users hands are disabled or occupied. If the computer can determine where the user is looking at any given time it can present various options.
There are two main ways of recording eye mute and converting it into input data:
a) Electrophysiological
These records the movement of the muscles that control the eye. Electrodes have to be secured to the skin to detect muscle movement and is therefore subject to general body muovement.
(ii) Photoelectric reflection
These records movement in reflected light from the eye. A user is required to track an object on screen by moving his eyes to maintain a stable image on the central part of the retina where vision is most concentrated.
Matching Devices with the Environment of use:
A user may be in a situation where standard input devices may not be available or cannot be used. In such situations then you should consider technologies that are appropriate to the environment e.g digitizing pen for field work.
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