Glossary
Searchable terminology from accessibility, web standards, and related fields.
14 results found in Text Entry.
- Decision Delay (Cognitive Delay, Selection Delay)
- The time a user spends deciding whether to accept or reject a suggestion from a predictive system, such as a word prediction list on an assistive technology device or keyboard. Decision delay is a cog…
- EdgeWrite (Edge Write)
- A gestural text entry method that uses the physical edges and corners of a square input area to guide character formation. Unlike traditional handwriting recognition that analyzes the full path of a s…
- Keypad (Numeric Keypad, Phone Keypad, Small Keypad)
- A keypad is a compact input device with a small number of keys, typically arranged in a 3x4 grid (phone keypads) or other constrained layouts. In accessibility contexts, keypads are relevant both as t…
- Keystroke Saving (KS, Keystroke Reduction)
- A metric used to evaluate word prediction and word completion systems, measuring the percentage of keystrokes that a user can avoid by accepting system predictions instead of typing each character ind…
- Keystrokes Per Character (KSPC)
- A metric used to evaluate the efficiency of text-entry methods by measuring the average number of keystrokes required to produce each character of text. A lower KSPC indicates a more efficient input m…
- Minimum String Distance (MSD, Edit Distance, Levenshtein Distance)
- A metric for measuring text entry accuracy by calculating the minimum number of single-character insertions, deletions, and substitutions needed to transform the transcribed text into the intended tex…
- MultiTap (Multi-Tap)
- A standard text-entry method used on mobile phone keypads where groups of three or four letters are assigned to each numeric key, and users press the key consecutively to cycle through the available l…
- NavTap
- A navigational text-entry method designed for blind mobile phone users that reduces the cognitive load associated with inputting text without visual feedback. NavTap organizes the alphabet into five r…
- Predictive Disambiguation (Dictionary-based Predictive Disambiguation, DBPD, Word Disambiguation)
- Predictive disambiguation is the class of text-entry techniques in which each user input event is intentionally ambiguous (one keystroke covers several possible letters, one swipe covers many possible…
- Segmentation Problem (Stroke Segmentation, Input Segmentation, Gesture Segmentation)
- The segmentation problem in text entry and gesture recognition refers to the challenge of determining where one input unit (such as a letter, word, or gesture) ends and the next begins when there is n…
- Switch Keyboard (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 cur…
- T9 (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. Rathe…
- Text Entry Rate (Typing Speed, Characters Per Minute, CPM, Words Per Minute, WPM)
- 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…
- Text Generation Rate (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 beca…