Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Systematic Review(also: Systematic Literature Review)
- A systematic review is a rigorous, reproducible synthesis of research on a narrowly-defined question, using a pre-registered protocol, exhaustive database search, explicit inclusion and exclusion criteria, independent dual screening, formal quality appraisal, and - where…
- Theory of Change(also: ToC, Logic Model)
- An explicit articulation of how and why a planned intervention is expected to produce its intended outcomes - typically expressed as a chain linking inputs to activities, outputs, short- and long-term outcomes, and the assumptions connecting each step. A theory of change makes…
- Trace Center(also: Trace Research and Development Center)
- A leading accessibility research center originally founded at the University of Wisconsin-Madison in 1971, now at the University of Maryland. The Trace Center pioneered foundational work in accessible technology, including early accessibility guidelines that influenced Section…
- Unity Assumption
- A concept from multisensory-perception research (Welch and Warren, 1980; Welch, 1999) describing the observer's implicit judgement that signals arriving through different senses originate from the same underlying event or object. When the unity assumption holds, the brain fuses…
- User Interface Agent(also: Interface Agent, Software Agent, Assistant Agent)
- A software component that observes user behaviour and the state of an application, then unobtrusively offers help — suggestions, shortcuts, summaries, or warnings — to reduce workload or prevent errors. In accessibility research, interface agents have been used to monitor a…
- VLAT(also: Visualization Literacy Assessment Test)
- A standardized 53-item test developed by Lee, Kim, and Kwon to measure a person's ability to read and interpret data visualizations across 12 chart types. Widely used as a baseline for comparing visualization literacy between groups and for evaluating the impact of assistive…
- W4A(also: International Cross-Disciplinary Conference on Web Accessibility, Web for All)
- An annual research conference focused specifically on web accessibility, held in conjunction with the World Wide Web Conference (WWW/TheWebConf). W4A brings together researchers studying how to make the web accessible to people with disabilities, covering topics such as…
- WEIRD(also: Western, Educated, Industrialized, Rich, and Democratic)
- An acronym standing for Western, Educated, Industrialized, Rich, and Democratic — used to describe the demographic and cultural profile of populations that dominate research samples in psychology, HCI, and accessibility studies. The term highlights a significant bias: most…
- Wide-Range Achievement Test(also: WRAT, WRAT-5, WRAT sentence comprehension)
- A standardised achievement test used to measure basic academic skills, including word reading, sentence comprehension, spelling, and math computation. In accessibility research, the WRAT sentence-comprehension sub-test has been validated as a measure of English literacy for Deaf…