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=== Motor and dexterity impairments ===
Some people may not be able to use a conventional [[input device]], such as the [[computer mouse|mouse]] or the [[computer keyboard|keyboard]]. Therefore, it is important for software functions to be accessible using both devices. Ideally, the software will use a generic input [[API]] that permits the use even of highly specialized devices unheard of at the time of software's initial development. [[Keyboard shortcuts]] and [[mouse gesture]]s are ways to achieve this access, as are more specialized solutions, including on-screen software keyboards and alternate input devices ([[Switch Access|switches]], [[joystick]]s and [[trackball]]s). Users may enable a [[Bounce keys|bounce key]] feature, allowing the keyboard to ignore repeated presses of the same key. [[Speech recognition]] technology is also a compelling and suitable alternative to conventional keyboard and mouse input as it simply requires a commonly available audio headset.
[[User interface design|UI design]] can also improve accessibility for users with motor impairments. For example, [[barrier pointing]] design allows commonly-used functions to require less accuracy to select.
The [[astrophysics|astrophysicist]] [[Stephen Hawking]] is an example of someone with severe motor and physical limitations who used assistive technology to support [[activities of daily living]]. He used a switch, combined with special software, that allowed him to control his [[wheelchair]]-mounted computer using his limited and small movement ability. This personalized system allowed him to remain mobile, do research, and produce his written work. Prof. Hawking also used [[augmentative and alternative communication]] technology to speak and an [[environmental control device]] to access equipment independently.
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