Glossary

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Tactile Exploration(also: Haptic Exploration, Touch-Based Exploration)

The process of perceiving and understanding objects, surfaces, or spatial layouts through systematic touch. For blind and low vision users, tactile exploration is a primary means of gathering spatial and structural information about the physical world. Effective tactile…

Tactile User Interface(also: Tactile UI, TUI)

A user interface designed to be operated and understood through the sense of touch, enabling interaction for blind and low vision users. Tactile user interfaces may include physical buttons with tactile markings, raised icons, textured surfaces that indicate different functional…

Tangible Interface(also: Tangible User Interface, TUI)

A user interface that uses physical objects as representations and controls for digital information, allowing users to interact through touch and manipulation of tangible artifacts. In accessibility contexts, tangible interfaces have been used for braille literacy education…

Tangible Technology(also: Tangible Interface, Tangible User Interface, TUI)

Technology that connects physical objects to digital systems, allowing users to interact with computing through touching, manipulating, and moving real-world objects rather than through screens or keyboards. Tangible technologies are particularly valuable in accessibility…

Tangible User Interface(also: TUI, Physical Interface)

An interface in which users interact with digital information through physical objects and surfaces in the real world. Tangible user interfaces bridge the gap between digital and physical by giving digital data a physical form that can be grasped, moved, and manipulated. For…

Tangible interaction(also: Tangible user interface, TUI, Physical computing)

An interaction paradigm in which users manipulate physical objects and materials to interact with digital information, bridging the gap between the physical and digital worlds. Tangible interfaces leverage people's existing skills in manipulating physical objects, making them…

Tap-to-Hear(also: Point-to-Hear, Tap-to-Listen, Point-and-Click Exploration)

An interaction paradigm used in tactile graphic readers and touch-based accessibility tools where users touch or tap on elements of a tactile graphic to trigger spoken audio descriptions of the element beneath their finger. Tap-to-hear is the current standard approach for…

Tappability(also: Tap Target, Tappable)

The property of a user interface element that indicates whether it can be activated by tapping on a touchscreen device. Tappability is a key concern in mobile accessibility because elements that appear tappable but are not (or vice versa) create barriers for users who rely on…

Target Expansion(also: Expanding Targets, Dynamic Target Sizing)

An interaction technique where clickable interface elements dynamically grow in size as the cursor approaches, making them easier to select while conserving screen space when not being targeted. Research shows target expansion can reduce selection times by up to 14% and error…

Target Size(also: Touch Target Size, Click Target Size, Hit Area)

The physical dimensions of an interactive element on screen — such as a link, button, or checkbox — that a user must point to and activate. Adequate target size is critical for users with motor impairments, tremor, or limited dexterity, as small targets require greater precision…

Target acquisition(also: Target selection, Pointing task)

The process of moving a pointer or input device to a specific on-screen element and selecting it, such as tapping an icon, clicking a button, or choosing a menu item. Target acquisition is a fundamental interaction in graphical user interfaces, and its difficulty is influenced…

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…

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