Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- SUS(also: System Usability Scale)
- Abbreviation for System Usability Scale, a ten-item questionnaire developed by John Brooke in 1986 that produces a single usability score from 0 to 100 based on user ratings of agreement with statements about a system. SUS is widely used in accessibility and HCI research because…
- Semantic distance(also: Semantic similarity, Word embedding distance)
- A computational measure of how different two words are in meaning, typically derived from word embedding models like word2vec that represent words as vectors in a high-dimensional space. In caption evaluation for DHH users, semantic distance between an ASR error and the intended…
- Single-case experimental design(also: SCED, N-of-1 design, ABAB design)
- A rigorous research methodology that evaluates intervention effects by systematically alternating between baseline and treatment conditions within individual participants, using each person as their own control. Common variants include AB, ABA, ABAB, and multiple-baseline…
- Spearman correlation(also: Spearman rank correlation, Spearman's rho)
- A non-parametric statistical measure of the strength and direction of the monotonic relationship between two ranked variables, ranging from -1 to +1. In accessibility evaluation research, Spearman correlation is used to assess how well automated metrics (such as Word Error Rate…
- Summative Evaluation(also: Summative Usability Testing, Summative Assessment)
- Usability evaluation conducted on functional software or high-fidelity prototypes, typically later in the development process, to measure the effectiveness of specific design choices. Summative testing uses representative users performing representative tasks and often involves…
- System Usability Scale(also: SUS)
- A widely used 10-item Likert scale questionnaire developed by John Brooke in 1996 that provides a quick, reliable measure of perceived usability. Scores range from 0 to 100, with higher scores indicating better usability. The SUS has been validated across thousands of studies,…
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