Glossary

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Scanning Delay(also: Tscan, Scan Rate, Dwell Time)

The time interval a scanning system waits before automatically advancing to highlight the next item. Setting scanning delay appropriately is critical for switch access users: too short causes selection errors because the user cannot respond quickly enough; too long dramatically…

Scanning Rate(also: Scan Rate, Scan Speed, Dwell Time)

The speed at which options in a scanning interface are sequentially highlighted, typically measured in seconds per item. The scanning rate is a critical configuration parameter in switch-access systems — too fast and the user cannot react in time to make a selection, too slow…

Scanning System(also: Automatic Scanning, Group Scanning, Row-Column Scanning)

An assistive technology input method in which selectable items are sequentially highlighted on screen, and the user activates a switch (or other simple input) when the desired item is highlighted. Scanning systems are designed for people with severe motor disabilities who can…

Switch Keyboard(also: Scanning Keyboard, On-Screen Scanning Keyboard)

A switch keyboard is a virtual keyboard interface designed for people with severe motor disabilities who cannot use a standard keyboard or pointing device. It works through a scanning mechanism: a cursor automatically moves across rows and columns of the keyboard, and the user…

Switch Scanning(also: Scanning Mode, Auto Scanning)

An input method for assistive technology where options are sequentially highlighted (scanned) and the user activates a single switch to select the currently highlighted item. This enables people with severe motor disabilities to access computers, communication devices, and other…

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