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Although we normally associate direct input with touch screens, it is not true to say that touch screens are preferred over keyboards. Unlike hardware keyboards, virtual keyboards do not provide any form of tactile feedback, for instance. However, as voice controlled devices continue to improve, the need for keyboard entry will diminish. After all, why would you type a letter when you can simply dictate it?

However, there are obvious areas where direct input excels over keyboard entry, such as graphic design through light pens, and smart phone technology. With traditional keypad phones, there's just one physical input device with small keys and a relatively small output device. But with touch screen technology, input and output are combined and the interface becomes adaptive, more intuitive and more direct.

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