Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Redundant Input(also: Redundant Input Channels, Multimodal Redundancy)
- A design approach in which a user interface accepts the same command through more than one input channel — for example, voice and gesture, keyboard and pointer, or speech and switch — so that users can choose whichever modality suits their current abilities, context, or…
- 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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