Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Remnant book(also: remnant scrapbook, memory book)
- An AAC strategy that uses collected physical artifacts—such as ticket stubs, photos, business cards, and other tangible items—organized in a book or album to support communication for people with aphasia or other cognitive-communication disorders. Remnant books leverage…
- Response Time(also: Reaction Time, Tact)
- The time elapsed between the presentation of a stimulus and the user's physical response, typically measured in milliseconds. In scanning-based AAC, response time (often called Tact) is the interval between when an item is highlighted and when the user activates the switch.…
- Row-Column Scanning(also: RCS, Grid Scanning, Two-Switch Scanning)
- The most widely used single-switch selection method for augmentative and alternative communication (AAC) devices and on-screen keyboards. Options are arranged in a two-dimensional grid, and the interface sequentially highlights each row. When the user clicks their switch, the…
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