Glossary

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Ability-based calibration(also: Adaptive calibration, Movement range calibration)

The process of adjusting a technology system's input sensitivity and thresholds to match an individual user's physical capabilities and range of motion, rather than assuming a normative body. In motion-based gaming and rehabilitation, ability-based calibration typically involves…

Accessible Gesture Interaction(also: Inclusive Gesture Design)

The design and implementation of gesture-based interactions that can be effectively used by people with diverse abilities, including those with motor impairments, visual disabilities, or conditions such as tremor, spasm, or limited range of motion. Accessible gesture interaction…

Active Exploration(also: User-Directed Exploration)

An interaction paradigm in non-visual interfaces where users physically control their navigation through information, discovering content by directing a pointer, stylus, or finger across a surface or through a virtual space. In contrast to passive exploration, where the entire…

Ad-Hoc Customization(also: On-the-Fly Customization, Real-Time Adjustment)

Making customization changes during content consumption rather than configuring all settings beforehand. For ADHD video viewers, ad-hoc customization was preferred by 75% of participants because it allows viewers to react to distractions as they encounter them while gaining…

Adaptive Disclosure(also: On-Demand Disclosure, Progressive Disclosure for Accessibility)

An interface design pattern in which supplementary accessibility content — summaries, keyphrase previews, navigation maps, alternative descriptions — is revealed only when the user requests it rather than shown alongside the primary content at all times. Adaptive disclosure…

Adaptive Interface(also: Adaptive UI, Self-Adapting Interface)

A user interface that automatically adjusts its layout, content, or behavior based on user context, abilities, preferences, or device constraints without requiring explicit user configuration. Adaptive interfaces in accessibility research have included systems that modify visual…

Adaptive Interface(also: Adaptive User Interface, Self-Adapting Interface)

A user interface that automatically modifies its presentation, behaviour, or content based on detected user characteristics, capabilities, preferences, or environmental conditions. In accessibility, adaptive interfaces can respond to changes in a user's sensory, motor, or…

Adaptive interface(also: Adaptive UI, Self-adapting interface)

A user interface that automatically adjusts its parameters — such as target sizes, input methods, timing, layout, or interaction modalities — in response to detected changes in the user's abilities, context, or preferences. Adaptive interfaces are a key implementation strategy…

Aftercare(also: Post-Interaction Care)

Reflective or supportive activity following an intimate, intense, or sensitive interaction, in which participants check in on each other's wellbeing, discuss the experience, and address any needs that arise. The concept is drawn into HCI through consent technology research as a…

Area Pointing(also: Point and Click, Mouse Pointing)

Area pointing is the conventional target-acquisition paradigm in graphical user interfaces, in which the user must move a cursor inside a confined two-dimensional target region and then execute a click (or equivalent dwell, tap, or activation action) to select it. Targets such…

Asymmetric Gameplay(also: Asymmetric Game Design, Asymmetric Multiplayer)

A game design approach where different players have different roles, abilities, information, or challenges within the same game. In the context of accessibility, asymmetric gameplay is a promising strategy for mixed-ability gaming because it allows each player's role and…

Asynchronous Control(also: Self-Paced Control, Asynchronous BCI)

A mode of interaction with a computer or assistive device where the user can issue commands at any time of their choosing, rather than being constrained to respond within system-defined time windows. In brain-computer interface research, asynchronous control is contrasted with…

Attention Management(also: Attention Design)

Design strategies and techniques that help users direct, maintain, and recover attention while interacting with digital content. For users with ADHD, attention management in interface design includes minimizing distractions (reducing visual clutter, hiding non-essential…

Attention Tunneling(also: Visual Tunneling, Attentional Tunneling, Cognitive Tunneling)

A phenomenon in which a user concentrates so narrowly on a primary information source - typically a visual overlay, head-up display, or instrument - that they fail to notice relevant events, objects, or hazards in their surrounding environment. In augmented and mixed reality,…

Audio Feedback(also: Auditory Feedback, Sound Feedback)

Information conveyed to a user through sound in response to an action or event within a system. Audio feedback encompasses a wide range of techniques including earcons (short abstract sounds), auditory icons (sounds that resemble real-world events), speech output, and…

Audio Icon(also: Auditory Icon, Earcon)

A non-speech sound used in a user interface to represent an object, action, or event, analogous to how visual icons represent concepts graphically. Audio icons use everyday sounds that have a natural association with what they represent (e.g., a crumpling sound for deleting a…

Audio-Based Interface(also: Audio Interface, Auditory Interface)

A computer interface that uses sound as the primary means of conveying information and supporting interaction, rather than visual display. Audio-based interfaces are essential for blind and visually impaired users and may employ speech output, environmental sounds, musical…

Audio-Haptic Feedback Layering(also: Multimodal Feedback Layering)

A design technique for managing multiple concurrent non-visual feedback signals by strategically prioritizing, staggering, and adjusting audio and haptic cues to prevent sensory overload. Techniques include audio cutting (interrupting lower-priority sounds when urgent cues are…

Audio-Spatial Mapping(also: Auditory-Spatial Mapping, Sound Spatialization)

A technique that uses sound properties such as pitch, volume, panning, and spatialization to represent spatial information non-visually. In accessibility contexts, audio-spatial mapping helps blind and low vision users build mental models of physical or virtual spaces by…

Audio-Tactile(also: Audio-Tactile Interaction, Audio-Haptic)

An interaction paradigm that combines tactile (touch-based) and auditory feedback to convey information. Audio-tactile systems pair physical surfaces, such as raised maps or 3D-printed models, with location-triggered audio output so that touching a specific area plays a…

Auditory Feedback(also: Audio Feedback, Auditory Display)

The use of sound — including tones, sound effects, earcons, and speech — to convey information about system states, user actions, or environmental changes. In accessibility, auditory feedback serves as a non-visual channel for communicating information that is typically…

Auditory Icon(also: Audio Icon)

A non-speech sound used in a user interface that represents an object, action, or event by mimicking its real-world sound — for example, the sound of crumpling paper to indicate deleting a file, or a camera shutter sound for taking a screenshot. Auditory icons rely on causal…

Aural Interaction(also: Auditory Interaction)

Aural interaction refers to human-computer interaction that takes place primarily through the auditory channel, encompassing both speech-based input/output and non-speech audio such as auditory icons, earcons, and sonification. A key characteristic distinguishing aural…

Barrier Pointing(also: Edge-Based Pointing)

An interaction technique for touch screens that uses the physical edges of a device as barriers to assist with target acquisition. When a target is placed near a screen edge, users can slide their finger or stylus toward the edge, using it as a physical stop to improve selection…

Binary Selection(also: Binary Choice, Yes/No Selection)

An interaction method where users make choices between two options at each step, progressively narrowing down to their desired selection through a series of binary decisions. Binary selection is used in some AAC systems, including Look to Speak where users look left or right to…

Body-Centric Design

Design approaches in technology that center on the user's physical body as the primary means of interaction, such as VR systems that rely on body tracking, gestures, and physical movement. While body-centric design can create natural and intuitive interactions, it inherently…

Brushing and Linking(also: Brush and Link, Linked Highlighting)

An interactive visualization technique where selecting or highlighting data in one chart automatically highlights the corresponding data in other linked charts within a dashboard. For example, clicking a bar in a bar chart might highlight the same data points in an adjacent…

Chairable(also: Chair-based interface, Wheelchair-integrated technology)

A design concept for input and output devices that are integrated directly into a wheelchair frame, enabling users to interact with assistive technology without requiring a separate smartphone, wearable device, or other external hardware. Chairables might include thin flexible…

Chairable computing(also: Chairable input, Wheelchair-integrated computing)

A design paradigm in which input devices and computing interfaces are integrated into the form factor of a wheelchair — particularly armrests, trays, and frames — analogous to how wearable computing fits with clothing. Chairable devices are always within reach, require no setup…

Clarifying Question(also: Clarifying Questions, Counter-Question)

A clarifying question is a follow-up query posed by a system or interlocutor to resolve ambiguity, fill missing context, or confirm intent before acting on a user's request. In conversational interfaces, clarifying questions are a core mechanism of mixed-initiative interaction:…

Click-Time Distribution(also: Timing Profile, Click Precision)

A statistical model of when a switch user activates their switch relative to a target timing event, used to characterize the precision and consistency of a user's motor control. In the Nomon interface, the click-time distribution measures how accurately a user clicks when a…

Click-on-Lift(also: Lift-off Activation, Release Activation)

An interaction technique where a touch target is activated only when the user lifts their finger from the screen while still within the target area, rather than registering the action at the point of initial contact. This approach is particularly beneficial for users with hand…

Closed-loop Interaction(also: Closed-Loop Feedback, Perform-Assess-Adjust Cycle)

An interaction pattern in which a system continuously observes the user's action, evaluates it, and returns immediate feedback that shapes the next attempt, producing an iterative perform-assess-adjust cycle. Closed-loop interaction contrasts with open-loop designs that present…

Clutching(also: Clutch Mechanism, Clutch Gesture)

In gesture- and motion-based input systems, a mechanism that lets the user temporarily disengage the recogniser so that everyday, non-communicative movements — reaching, adjusting posture, gesturing socially — do not trigger false activations. Named after the mechanical clutch…

Cocktail party effect(also: Selective auditory attention)

The well-documented human ability to focus auditory attention on a single speech source among multiple simultaneous conversations, while still detecting relevant information (such as one's name) in unattended streams. The cocktail party effect is foundational to the design of…

Cognitive Forcing Function(also: Cognitive Forcing)

A design technique that deliberately disrupts automatic cognitive processing to prompt users to engage in more deliberate, analytical thinking. In human-AI interaction, cognitive forcing functions are used to reduce over-reliance on AI outputs — for example, by asking users to…

Command-Line Interface(also: CLI, Command-Driven Interface, Command Interface)

A user interface style in which the user types textual commands, usually following a defined syntax, to drive a system. Command-line interfaces are typically fast and powerful for expert users, scriptable, and efficient for repetitive work, but require users to memorise commands…

Concurrent speech interface(also: Simultaneous speech, Parallel audio streams)

An interaction paradigm that presents multiple speech audio streams simultaneously, spatially separated using techniques like head-related transfer functions, to enable users to scan or monitor several information items in parallel rather than listening to them sequentially.…

Confidence score(also: Certainty score, Prediction confidence)

A numerical value (typically 0-100% or 0-1) indicating how certain an AI system is about its prediction or classification. In accessibility contexts, communicating confidence scores to users — particularly blind users who cannot visually verify AI output — helps them calibrate…

Confirmation Dialogue(also: Confirmation Dialog, Verification Prompt)

An interaction pattern where a system summarizes a proposed action and asks the user to confirm before executing it. In accessible calendar design and voice assistant interactions, confirmation dialogues are critical for preventing errors—users want the system to summarize…

Consent Model(also: Consent Framework)

A prescriptive framework specifying how consent should be requested, given, sustained, and revoked in a particular interaction context. Examples include affirmative consent (explicit verbal agreement), embodied consent (drawing on bodily and somatic cues), and haptic consent…

Content Prioritization(also: Content Ranking, Element Prioritization)

The process of ranking or scoring web page elements by their relevance or importance to a user's task, enabling the interface to highlight critical content and de-emphasize less relevant material. Content prioritization can be achieved through AI-powered relevance scoring, where…

Context Retention(also: Conversational Context, Context Awareness)

The ability of a voice assistant or AI system to maintain awareness of previous interactions and use that information to interpret subsequent commands correctly. In calendar accessibility, context retention is important because scheduling tasks often involve multi-turn…

Continuous Specification(also: Continuous Positioning, Continuous Cursor Movement)

In cursor control interfaces, a positioning method where the cursor moves steadily in a given direction at a controlled rate until the user signals it to stop. This approach allows precise positioning because the user can halt movement at exactly the desired location, but it is…

Conversational AI(also: Chat AI, AI Chatbot)

Artificial intelligence systems designed to engage in dialogue with users through natural language, including chatbots, virtual assistants, and generative AI interfaces. Conversational AI has accessibility implications both as an interaction paradigm that can be more accessible…

Conversational Gesture(also: Interaction Gesture, Dialogue Primitive)

A conversational gesture is an atomic building block of human-computer dialogue — a simple, well-defined interaction pattern that enables communication between user and machine. In graphical user interfaces, conversational gestures are realised through widgets such as list…

Conversational Interface(also: Conversational UI, Voice User Interface, VUI)

A user interface that enables interaction through natural language, either spoken or typed, allowing users to communicate with a system using conversational dialogue rather than traditional graphical controls. Conversational interfaces include voice assistants, chatbots, and…

Conversational Interface(also: Conversational UI, Conversational User Interface, Chat Interface)

An interface that enables interaction through natural language dialogue, either spoken or text-based, rather than through traditional graphical controls like buttons and menus. Conversational interfaces are significant for accessibility because they can reduce cognitive load,…

Conversational User Interface(also: CUI, Conversational Interface, Dialogue Interface)

A user interface that enables interaction through natural language conversation, either via voice (spoken dialogue) or text (chat). Conversational user interfaces encompass voice assistants, chatbots, and dialogue systems that interpret user intent and respond in natural…

Coordinated Views(also: Linked Views, Coordinated Multiple Views, Brushing and Linking)

A data visualization technique in which multiple representations of the same dataset are displayed simultaneously and kept synchronized, so that actions in one view (such as selecting, filtering, or sorting) are immediately reflected in all other views. In accessible data…