Glossary

Search results

Task-Specific Navigation(also: Task-Based Browsing, Goal-Directed Navigation)

A web interaction paradigm where the interface adapts to surface content relevant to a user's specific task or goal, filtering or de-emphasizing irrelevant elements. Task-specific navigation contrasts with general-purpose browsing by using knowledge of the user's intent to…

Technology acceptance model(also: TAM, UTAUT)

A theoretical framework predicting how users come to accept and use a technology, originally proposing that perceived usefulness and perceived ease of use determine adoption. The Unified Theory of Acceptance and Use of Technology (UTAUT) extended this with factors including…

Technology interdependence(also: Technological interdependence, Multi-tool strategy)

The strategic use of multiple complementary technologies in combination to accomplish tasks that no single tool can fully support. For people with disabilities, technology interdependence is particularly relevant in complex real-world activities like travel, where different…

Teleportation(also: VR Teleportation)

A VR locomotion method where users point to a destination in the virtual environment and are instantly transported there, bypassing the need for physical movement or continuous virtual walking. Teleportation is generally more accessible than free-roam locomotion for wheelchair…

Tile-Based Interface(also: Tile-Based Interaction)

An interaction paradigm that represents spatial content as a grid of discrete, navigable tiles rather than a continuous coordinate plane. In accessible design contexts, tile-based interfaces provide blind or visually impaired users with an alternative way to understand and…

Touch Exploration(also: Explore by Touch, Touch-Based Exploration)

An interaction method that allows users to discover on-screen content by moving their finger across a touchscreen, receiving audio feedback about elements under the fingertip. Touch exploration is fundamental to how blind and low-vision users navigate mobile devices through…

Touch Target Size(also: Tap Target Size, Target Size)

The physical area of an interactive element on a touchscreen that responds to user input. Adequate touch target sizing is critical for accessibility, particularly for users with motor impairments who may have difficulty precisely tapping small areas. WCAG 2.2 Success Criterion…

Touch target(also: Tap target, Touch target size, Target size)

The interactive area on a touchscreen or pen-based display that responds to user input when tapped or pressed. Touch target size is a critical accessibility consideration because targets that are too small or too closely spaced cause selection errors, particularly for older…

Touch-to-Explore(also: Touch Exploration, Explore by Touch)

An interaction mode used by touchscreen screen readers (such as VoiceOver on iOS and TalkBack on Android) where users drag their finger across the screen to discover and hear descriptions of interface elements beneath their fingertip. As the user's finger passes over buttons,…

Touchscreen(also: Touch Screen, Touch Display)

An input and display device that detects touch gestures directly on its surface, allowing users to interact with content by tapping, swiping, pinching, or dragging. While touchscreens enable intuitive direct manipulation, they present accessibility challenges for users with…

Touchscreen Exploration(also: Touch Exploration, Direct Touch Exploration)

An accessibility interaction mode where blind and low vision users explore digital content by moving their finger across a touchscreen, receiving audio or haptic feedback about elements beneath their fingertip. Touchscreen exploration has been applied to 2-D interfaces (through…

Touchscreen text entry(also: Mobile typing, Virtual keyboard input)

The process of entering text on a touchscreen device using a virtual keyboard, which presents significant accessibility challenges for blind and visually impaired users who cannot see key boundaries or visual feedback. Screen reader users typically employ an explore-then-lift…

Unimodal Interface(also: Single-Mode Interface)

An interface that accepts input through only one mode or channel of interaction, such as keyboard-only, voice-only, or gesture-only input. In contrast to multimodal interfaces that combine multiple input methods, unimodal interfaces rely on a single input modality for command…

Unistroke Gesture(also: Single-Stroke Gesture, Unistroke)

A unistroke gesture is a shape or symbol drawn in a single continuous stroke on a touch screen or digitizer, which is then recognized by software as a specific command or input. In accessible interfaces for blind users, unistroke gestures provide an efficient way to create…

Unobtrusive Interaction(also: Unobtrusive Interfaces)

A design orientation, associated with ambient, wearable, and assistive-technology research, that aims to minimise disruption to users' natural behaviour, attention, and social presence. Rather than demanding foreground engagement (pulling up a phone, pressing through menus,…

User Agency(also: User Control, User Autonomy)

The degree to which users maintain control over their interactions with a system, including the ability to make choices, adjust system behavior, override automated decisions, and understand what the system is doing on their behalf. In accessibility and AI-powered tools, user…

User Elicitation(also: Elicitation study, Gesture elicitation study, User-defined gestures)

A participatory user-research method, widely used in gesture and interaction design, in which end users or domain experts are shown a desired system effect (a "referent" such as "rotate this object") and asked to propose the input action they believe should trigger it.…

Verification Mechanism(also: Verification System)

A feature or process that allows users to confirm that a system has correctly understood and executed their intended action. In accessible calendar design, verification mechanisms are critical because BLV users cannot quickly visually scan for errors and rely on the system to…

Verification loop(also: Feedback loop, Edit-verify cycle)

An interaction pattern in which a user performs an action, receives feedback about the result, evaluates whether the outcome matches their intent, and decides whether to accept, undo, or refine the action. In non-visual accessibility contexts, verification loops are essential…

Virtual Wall(also: Haptic Wall, Haptic Boundary)

A simulated physical boundary in a haptic interface that the user can feel through a force-feedback device, modelled as a massless plate backed by a spring with stiffness and a damper with viscosity. Virtual walls are used to represent the edges and boundaries of graphical user…

Visual Orchestration(also: Visual Attention Management)

A design orientation, articulated by Huffman et al. (2026), for deliberately coordinating visual cues, salience, timing, and layout so that participants in a shared environment know where to look, when to shift focus, and how interactions unfold — especially for users who rely…

Visual Programming(also: Visual Programming Language, Block-Based Programming)

A programming paradigm that allows users to create programs by manipulating graphical elements — such as blocks, nodes, and connecting paths — rather than writing text-based code. Popular examples include Scratch, LabVIEW, and dataflow systems where blocks represent…

Voice Control(also: Voice Command, Voice-Activated Control)

The ability to operate devices, applications, or systems using spoken commands. Voice control is a key accessibility feature in smart home technology, enabling people with mobility impairments, visual disabilities, or dexterity limitations to independently control their…

Voice Interface(also: Voice User Interface, VUI)

A user interface that accepts spoken language as input and typically provides audio output, enabling hands-free, eyes-free interaction with technology. Voice interfaces are used in voice-activated personal assistants, smart speakers, phone systems, and accessibility tools. For…

Voice Interface(also: Speech Interface, Voice User Interface, VUI)

An interface that allows users to interact with a system using spoken natural language commands rather than keyboard, mouse, or touch input. Voice interfaces range from simple command-and-control systems that recognise fixed phrases to conversational assistants that interpret…

Voice User Interface(also: VUI)

A user interface that enables interaction with a device or system through spoken voice commands and audio responses. Voice user interfaces use speech recognition to interpret user input and text-to-speech or pre-recorded audio for output. For accessibility, VUIs provide an…

Wake Word(also: Hotword, Trigger Word, Activation Word)

A specific word or phrase that activates a voice-controlled device, such as "Hey Google," "Alexa," or "Hey Siri." The wake word must be spoken before any command for the device to begin listening. Wake words present accessibility barriers for people with speech disfluencies, as…

Web Navigation(also: Website Navigation, Web Browsing Navigation)

The process of moving through and finding information on websites, encompassing strategies like following links, using search, scanning headings, and interacting with menus and filters. Web navigation presents fundamentally different experiences depending on access method:…

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…

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…