Glossary

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Workshop Accessibility(also: Accessible Workshop Design)

The practice of designing workshops, training sessions, and collaborative events to be fully participable by people with disabilities. Workshop accessibility encompasses multiple dimensions: physical environment (room layout, seating arrangements, accessible facilities),…

Workspace Awareness(also: Collaborator Awareness, Shared Workspace Awareness)

The up-to-the-moment understanding of another person's interactions within a shared workspace, including their location, actions, and intentions. In collaborative software development, workspace awareness encompasses knowing which file a colleague is viewing, what line they are…

World Design(also: Virtual World Design, Environment Design)

The creation and structuring of virtual environments in VR, including architecture, terrain, objects, lighting, and interactive elements. In accessibility contexts, world design directly impacts whether disabled users can navigate and engage with virtual spaces. Key…

World-Making(also: Worldmaking)

World-making, drawing on Nelson Goodman's 'Ways of Worldmaking' and extended in disability scholarship by Faye Ginsburg and Rayna Rapp, refers to the active construction of shared social worlds through symbols, practices and routines rather than the passive inhabitation of fixed…

World-Readiness Standards for Learning Languages(also: ACTFL World-Readiness Standards, WRSLL, 5 Cs of Foreign Language Education)

A set of US national standards for language education published by the American Council on the Teaching of Foreign Languages (ACTFL). The standards are organised around five goal areas — Communication, Cultures, Connections, Comparisons, and Communities (the "5 Cs") — and apply…

Wrapper(also: Web Wrapper, Data Wrapper)

In web accessibility and data extraction contexts, a reusable program that maps the visual layout of a web page to its underlying structured dataset by identifying records and fields within the HTML. Wrappers reverse the rendering process, extracting semantic structure from…

Wrapping(also: Focus Wrapping, Cursor Wrapping)

An interface navigation technique where the focus or cursor automatically returns to the beginning of a line, list, or group of elements when it reaches the end, or vice versa. In accessible interfaces designed for low bandwidth input, wrapping reduces the number of signals…

Wrist Gesture(also: Wrist-Based Gesture, Hand Gesture Input)

A movement of the wrist or hand used as an input command for interacting with wearable devices, particularly smartwatches. Wrist gestures enable one-handed, eyes-free interaction by allowing users to control their device using the same hand that wears the watch, without needing…

Written Choice(also: Written Choice Technique)

A therapeutic communication technique used with individuals who have aphasia, in which a conversation partner asks a question and then provides anticipated written answers for the person to choose from. This scaffolded approach reduces the language production demands on the…

X3D(also: Extensible 3D, Extensible 3D Graphics)

An ISO-standard XML-based file format and runtime architecture for representing and communicating 3D scenes and objects on the web. X3D is the successor to VRML (Virtual Reality Modeling Language) and is maintained by the Web3D Consortium. In the accessibility context, X3D is…

XForms(also: W3C XForms)

XForms is a W3C specification for web forms that separates the purpose of a form (its data model) from its visual presentation, providing richer semantics than traditional HTML forms. Unlike HTML forms where controls are defined by their visual representation (radio buttons,…

XHTML(also: Extensible HyperText Markup Language, XHTML 1.0, XHTML 2.0)

XHTML (Extensible HyperText Markup Language) is a family of W3C specifications that reformulated HTML as an XML application, requiring stricter syntax rules such as properly nested elements, lowercase tag names, and quoted attribute values. XHTML 1.0, published in 2000, was…

XML(also: Extensible Markup Language)

A markup language designed by the W3C for encoding structured data in a format that is both human-readable and machine-readable. Unlike HTML, which has a fixed set of tags focused on presentation, XML allows authors to define custom tags that describe the meaning and structure…

XPath(also: XML Path Language)

XPath (XML Path Language) is a query language for selecting nodes and computing values from XML and HTML documents. In the context of web accessibility, XPath expressions are used by assistive technologies and accessibility tools to identify and target specific elements within a…

XR Accessibility(also: Extended Reality Accessibility, Immersive Accessibility)

The practice of designing virtual reality (VR), augmented reality (AR), and mixed reality (MR) experiences that are usable by people with disabilities. XR accessibility encompasses challenges across motor, visual, auditory, cognitive, and vestibular domains, including the…

XR Accessibility User Requirements(also: XAUR)

A W3C document that provides accessibility guidelines and user requirements specifically for extended reality (XR) applications, including virtual reality, augmented reality, and mixed reality. XAUR identifies the diverse needs of users with disabilities in XR environments and…

XSLT(also: Extensible Stylesheet Language Transformations, XSL Transformations)

A W3C standard language for transforming XML documents into other formats such as HTML, plain text, or different XML structures. XSLT uses template rules that match patterns in the source XML and produce corresponding output, enabling the separation of content from presentation.…

Xbox Adaptive Controller(also: XAC)

A Microsoft-manufactured game controller designed for players with limited mobility. It provides a large flat-surface form factor with two oversized programmable buttons and 19 external 3.5 mm jacks plus USB ports, so it can be connected to a wide range of external switches,…

Xbox Controller Assist(also: Xbox Copilot)

A Microsoft software feature (formerly called Xbox Copilot) available on Xbox consoles and Windows PCs that links two physical controllers so they behave as a single controller — any input from either pad is treated as if it came from one player. It is explicitly advertised as…

Y-BOCS(also: Yale-Brown Obsessive Compulsive Scale)

The most widely used clinical assessment tool for measuring the severity of OCD symptoms. The Y-BOCS includes a symptom checklist that categorizes obsessions and compulsions by type, and a severity scale that rates the time occupied by symptoms, interference with functioning,…

YOLO(also: You Only Look Once)

YOLO (You Only Look Once) is a real-time object detection algorithm that identifies and locates objects within images or video frames in a single pass through a neural network. In accessibility applications, YOLO enables systems to automatically detect objects, people, and…

YOLO (You Only Look Once)(also: YOLO, YOLOv8, YOLO Object Detector)

A family of real-time object detection neural networks that predict bounding boxes and class labels in a single forward pass over an image, rather than using a two-stage propose-then-classify pipeline. YOLO has become a workhorse detector for accessibility research and assistive…

YouDescribe

A free web platform operated by the Smith-Kettlewell Eye Research Institute that enables volunteers to crowdsource audio descriptions for YouTube videos. Viewers can request a video be described and sighted volunteers record and align AD tracks synchronised with the original…

YouTube Accessibility(also: Video Platform Accessibility)

The degree to which YouTube and similar video platforms can be effectively used by people with disabilities, including availability of captions, audio descriptions, screen reader compatibility, and keyboard navigation. For teachers with vision impairments in India, YouTube…

Z-Order(also: Stacking Order, Layer Order)

Z-order refers to the front-to-back layering sequence of overlapping objects on a 2-D digital canvas, determining which objects appear in front of or behind others. In accessibility, Z-order is significant because screen readers in presentation software often read objects…

Zancolli Classification(also: Zancolli Scale)

A clinical classification system for residual upper-limb function after cervical spinal cord injury, developed by Argentine surgeon Eduardo Zancolli. The scale categorises hand and wrist function by the highest preserved motor level (C5, C6, C7, C8) and further subdivides C6 and…

Zeigarnik Effect

A psychological phenomenon identified by Bluma Zeigarnik in 1927 describing the tendency for people to remember interrupted or incomplete tasks better than completed ones. The effect explains why partially finished challenges, multi-level games, and serialized learning modules…

Zernike Polynomials(also: Zernike Coefficients, Zernike Modes)

A set of mathematical functions used to describe the shape of optical wavefronts, commonly employed in ophthalmology and optometry to characterise the optical aberrations of the human eye. Each Zernike polynomial represents a specific type of optical distortion — for example,…

Zero-Knowledge Proof(also: ZKP, Zero-Knowledge Protocol)

A zero-knowledge proof (ZKP) is a cryptographic method by which one party (the prover) can convince another party (the verifier) that a statement is true without revealing any information beyond the truth of the statement itself. For example, a voter can prove they are eligible…

Zero-Shot Learning(also: Zero-Shot Prompting, Zero-Shot Inference)

A machine-learning approach in which a model performs a task on classes or scenarios it has never seen explicit training examples for, relying entirely on its pre-trained knowledge and the structure of the prompt or input. In LLM-based accessibility testing, zero-shot prompting…

Zero-Touch Interaction(also: Touchless Interaction, Hands-Free Interaction)

An interaction paradigm that allows users to control devices or systems without physically touching them, typically through voice commands, gestures detected by cameras or sensors, or ambient sensing. Zero-touch interaction is particularly important for accessibility in contexts…

ZigBee(also: IEEE 802.15.4)

A low-power, low-data-rate wireless networking protocol based on the IEEE 802.15.4 standard, designed for short-range communication between devices in personal area networks. In accessibility and assistive technology contexts, ZigBee has been used in indoor navigation and…

Zipf's Law

A statistical observation that in any natural language corpus, the frequency of a word is inversely proportional to its rank in the frequency table. The most common word occurs roughly twice as often as the second most common, three times as often as the third, and so on. In…

Zone of Proximal Development(also: ZPD)

A concept from educational psychologist Lev Vygotsky describing the range of tasks that a learner can perform with the assistance of a more competent individual (scaffolding) but cannot yet perform independently. The ZPD lies between the zone of actual development (what the…

Zoom Fatigue(also: Video Call Fatigue, Teleconference Fatigue)

The exhaustion and mental strain experienced from prolonged use of video conferencing platforms, caused by the increased cognitive effort required to process non-verbal cues such as facial expressions, tone of voice, and body language through imperfect audiovisual technology.…

Zoom Interface(also: Zoom Screen, Zoomable User Interface, ZUI)

A user interface technique that allows users to magnify a portion of the screen to increase the effective size of interface elements, making them easier to select with low-precision pointing devices such as eye trackers or head mice. Unlike simple screen magnification for low…

Zoom cycling(also: Zoom toggling, Magnification cycling)

An interaction behaviour observed in screen magnifier users who frequently alternate between high magnification (to read fine details like axis labels and segment boundaries) and lower magnification (to see overall chart structure and make comparisons). Zoom cycling adds…

ZoomText

A commercial screen magnification and screen reading software for Windows, developed by Freedom Scientific (formerly Ai Squared). ZoomText provides up to 60x magnification along with features like smooth font display, cursor enhancements, focus tracking, and a built-in screen…

aDesigner

aDesigner is an accessibility evaluation tool for web designers, originally released by IBM in the mid-2000s. It combined automated WCAG checking with simulations of low vision (contrast loss, blur, colour-blindness) so that sighted designers could see how a page would appear to…

axe DevTools(also: axe, axe-core)

A widely used suite of automated accessibility testing tools developed by Deque Systems, available as browser extensions, command-line tools, and integrable libraries. The axe-core engine is an open-source JavaScript library that tests web content against WCAG success criteria…

contentDescription(also: content description, android:contentDescription)

An Android accessibility attribute that provides a text description for UI elements, particularly those without visible text such as ImageButtons and ImageViews. When set, TalkBack and other Android screen readers announce this description to users. For elements that rely solely…

d/Deaf(also: Deaf, deaf, Big D Deaf)

A convention used to distinguish between two meanings of the word deaf. Uppercase "Deaf" refers to people who identify as culturally Deaf and are part of the Deaf community, sharing a common language (sign language), values, and social norms. Lowercase "deaf" is an audiological…

e-MAG(also: Modelo de Acessibilidade em Governo Eletrônico, Electronic Government Accessibility Model)

The Brazilian government accessibility model (Modelo de Acessibilidade em Governo Eletrônico) that establishes standards and guidelines for making government websites accessible to people with disabilities. First published in 2005 and updated through version 3.1, e-MAG is based…

e-NABLE(also: Enabling the Future)

A global volunteer network founded in 2013 that uses 3D printing to produce free, customizable upper-limb prosthetic devices — primarily for children with limb differences who outgrow conventional prosthetics quickly. e-NABLE connects makers, designers, medical professionals,…

eAccessibility(also: Electronic Accessibility, ICT Accessibility, Digital Accessibility)

The concept of ensuring that all people, including those with disabilities and elderly people with reduced functional capabilities, have equal access to information and services made available through electronic and digital technologies. eAccessibility encompasses websites,…

eBook(also: Electronic Book, Digital Book, E-Book)

A book published in digital format that can be read on computers, tablets, e-readers, or smartphones. When properly formatted, eBooks offer significant accessibility advantages including adjustable text size, customizable fonts and colors, text-to-speech compatibility, and…

eBook Accessibility(also: Electronic Book Accessibility, Digital Book Accessibility)

The practice of ensuring that electronic books and digital publications are usable by people with disabilities, including those who use screen readers, refreshable braille displays, or other assistive technologies. Accessible eBooks require proper semantic structure (headings,…

eIDAS(also: electronic IDentification, Authentication and trust Services, eIDAS 2.0)

A European Union regulation governing electronic identification and trust services across the single market. The revised eIDAS 2.0 regulation, adopted in 2024, requires each member state to provide a European Digital Identity (EUDI) Wallet to all citizens and residents by the…

eMAG(also: Modelo de Acessibilidade em Governo Eletrônico, Brazilian Digital Accessibility Model)

The Brazilian government's digital accessibility model (Modelo de Acessibilidade em Governo Eletrônico) that provides mandatory guidelines for how government websites must ensure accessibility and eliminate access barriers. Based on WCAG 2.0, eMAG covers all Level A and AA…

eMaking(also: Electronic Making, e-Making)

A form of making that focuses on electronic and digital fabrication tools and activities, including 3D printing, laser cutting, programming microcontrollers, robotics, and working with electronic components such as LEDs, motors, and sensors. eMaking programs aim to build STEAM…