Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- T9(also: Text on 9 Keys, Tegic T9)
- T9 (Text on 9 Keys) is a dictionary-based predictive text-entry method developed by Tegic Communications in the 1990s for mobile phone keypads with multiple letters assigned to each numeric key. Rather than pressing a key multiple times to cycle through letters (the older…
- Text Entry Rate(also: Typing Speed, Characters Per Minute, CPM)
- A measure of how quickly a user can input text using a given method, typically expressed in words per minute (WPM) or characters per minute (CPM). One word is conventionally defined as five characters including spaces. For standard QWERTY keyboards, professional typists achieve…
- Text Generation Rate(also: TGR, Text Entry Rate, Text Entry Speed)
- The speed at which a user produces text, typically measured in words per minute (WPM) or characters per second. Text generation rate is a key performance metric in assistive technology evaluation because it captures the overall efficiency of a text entry system, accounting for…
- Textonym(also: T9 Ambiguity)
- Words that share the same sequence of key presses on a telephone-style number pad, such as "bat" and "cat" which both map to the key sequence 2-2-8. Textonyms are a significant design consideration in AAC and text entry systems that use reduced keyboard layouts, as the system…
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