Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
Search results
- Valence-Arousal Model(also: VA Model, Circumplex Model, Valence-Arousal Space)
- A two-dimensional model of affect, introduced by Russell (1980), that represents emotional states along two orthogonal axes: valence (pleasant versus unpleasant) and arousal (activated versus deactivated). Emotions such as cheerful, tense, calm, and sad map to the four quadrants…
- Value Sensitive Design(also: VSD)
- A design methodology that accounts for human values in a principled and systematic way throughout the technology design process. Value Sensitive Design integrates three types of investigation: conceptual (identifying stakeholders and their values), empirical (studying how people…
- Video Coding(also: Behavioural Video Coding, Video Data Coding)
- A systematic research method in which trained analysts review video recordings to identify, label, and categorise specific behaviours, actions, emotions, or events. In accessibility and usability research, video coding is used to analyse recordings of user testing sessions to…
- Video Elicitation Study(also: Video Elicitation Method)
- A research methodology in which participants view video demonstrations of interactions, interfaces, or technologies and then provide feedback, preferences, or reactions based on what they observed. This method is particularly valuable in accessibility research because it allows…
- Viewability(also: Video Viewability)
- A subjective measure of how watchable and consumable a video is for a particular viewer, encompassing factors like ability to focus on content, level of distraction, information comprehension, and overall comfort with the viewing experience. In ADHD accessibility research,…
- Vignette Study(also: Vignette-Based Method, Vignette)
- A research method in which participants are presented with short, carefully constructed scenarios describing hypothetical or realistic social situations, then asked to make judgments about appropriateness, fairness, emotional impact, or likely outcomes. Vignettes are widely used…
- Virtual audit(also: Remote audit, Virtual streetscape audit, GSV audit)
- A method of assessing the physical environment for accessibility features and barriers using street-level imagery such as Google Street View, rather than conducting in-person site visits. Virtual audits allow researchers and practitioners to evaluate conditions like sidewalk…
- Visual Attention(also: Attentional Allocation, Gaze Behaviour)
- The cognitive process of selectively focusing on specific parts of the visual field while filtering out other information. Visual attention determines which elements in a scene or interface a person notices, how long they focus on them, and in what order. Research has shown that…
- Viterbi Algorithm
- The Viterbi algorithm is a dynamic-programming procedure for finding the most likely sequence of hidden states in a Hidden Markov Model given a sequence of observations. It is the standard solution to part-of-speech tagging, many speech-recognition tasks, and decoding problems…
- Vulnerable population research(also: Research with vulnerable groups)
- Research involving participants who may have diminished capacity to provide fully informed consent or who are at elevated risk of harm, including older adults with cognitive decline, people with dementia, children with disabilities, and individuals with intellectual…
10 results.