Glossary

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Chunking

In cognitive science and human-computer interaction, chunking refers to the mental strategy of grouping individual items of information into larger, unified units (chunks) to reduce working memory load. Because human working memory can hold approximately four to seven items at a…

Clicking Error(also: Click Slip, Selection Error)

An unintended mouse input that occurs during the clicking phase of target selection, distinct from errors in cursor positioning. Common clicking errors include slipping off the target (the cursor moves between button press and release), accidental clicks made while the mouse is…

Closed-Loop Adaptation(also: Closed-Loop System, Adaptive Loop)

A system design approach where real-time feedback from sensors or user behavior is continuously monitored and used to automatically adjust the system's response. In accessibility technology, closed-loop adaptation enables interfaces to respond dynamically to users' physiological…

Co-Embodiment(also: Shared Embodiment, Collaborative Embodiment)

A design concept where multiple users jointly control or inhabit a single virtual body or avatar, each contributing different aspects of the character's movements or actions. In CoSignPlay, co-embodiment allows one player to control non-manual signs (facial expressions, head…

Co-Located Collaboration(also: Co-Located Cooperation)

Co-located collaboration is the shared activity of people working or playing together while physically present in the same space, as distinct from remote or distributed collaboration. In HCI and accessibility research, co-located collaboration is studied because it adds embodied…

CogTool

A cognitive modeling tool developed at Carnegie Mellon University that generates quantitative predictions of human task performance times based on the Keystroke-Level Model (KLM) and the ACT-R cognitive architecture. Designers create storyboards of user interface screens and…

Cognitive Cycle(also: Cognitive Processing Time, Cognitive Response Time)

In the Model Human Processor framework, the cognitive cycle represents the time required for a person to process perceived information and make a decision about how to respond. A single cognitive cycle is approximately 70-110 milliseconds. Research with motion-impaired users has…

Cognitive Strategy Prompting(also: Cognitive Scaffolding, Strategy Prompting)

A design technique that provides cues or prompts within an interface to help users employ effective cognitive strategies for completing tasks, particularly benefiting users experiencing age-related cognitive decline or cognitive disabilities. Examples include framing tasks using…

Cognitive load(also: Mental load, Cognitive burden, Cognitive demand)

The total amount of mental effort required to complete a task, encompassing the processing of information, decision-making, remembering instructions, and managing attention. Cognitive load theory, developed by John Sweller in the 1980s, distinguishes between intrinsic load…

Command Recognition(also: Command Classification, Input Recognition)

The process by which a computer system interprets and classifies a user's input action — such as a gesture, voice command, or key press — as a specific intended command from a predefined vocabulary of possible commands. The accuracy of command recognition is characterised by the…

Common Ground(also: Grounding, Mutual Understanding)

The shared knowledge, beliefs, and assumptions that conversation participants use to understand each other. In communication theory, grounding is the process by which speakers establish and maintain this mutual understanding through strategies such as referencing shared context,…

Communicability

A quality property of interactive systems proposed by Semiotic Engineering theory, referring to the system's ability to effectively and efficiently convey to users the designer's communicative intentions, logic, and underlying interaction principles. High communicability means…

Computer-Supported Cooperative Work(also: CSCW, Collaborative Computing)

A field of research and practice focused on how technology can support people working together, encompassing tools for communication, coordination, and collaboration such as chat systems, shared documents, video conferencing, and project management platforms. In accessibility,…

Conceptual Model(also: Mental Model)

A user's internal understanding of how a system works, including what actions are possible, what the current state is, and what the consequences of actions will be. Conceptual models are critical in accessibility because users who cannot build an accurate mental representation…

Cone Tree(also: Cone Trees, Cone Tree Visualization)

A 3D or 2D information visualization technique for displaying hierarchical data structures, where child nodes are arranged in a cone or fan shape around their parent node. When a user selects a child, the parent shrinks into the background and the selected item's children expand…

Confirmation Message(also: Positive Feedback, On-track Feedback, Progress Confirmation)

A system message that reassures users they are performing a task correctly or are on the right path, as opposed to only providing error messages or corrective instructions. In assistive technology and cognitive accessibility, confirmation messages have been shown to be…

Context-Aware Computing(also: Context Awareness, Situational Awareness Computing)

Computing systems that can sense and adapt their behavior based on the user's current context, including location, activity, environment, and task state. In accessibility, context-aware systems go beyond static information delivery to provide real-time, situation-appropriate…

Context-Aware Interface(also: Context-Sensitive Interface, Adaptive Interface)

A user interface that dynamically adapts its content, features, or behavior based on the user's current context, such as their location, current task, time of day, or the website they are visiting. In cognitive accessibility, context-aware interfaces are particularly valuable…

Conversational Scaffolding(also: Scaffolded Interaction)

Human or technology-provided support, prompts, or guidance that helps individuals accomplish communication tasks they might struggle with independently. In voice assistant contexts, scaffolding includes features like setting up calendars, providing reminders, and offering…

Critical Design(also: Critical Design Framework, Design Through Critique)

A research through design methodology that foregrounds the ethics of design practice, reveals potentially hidden agendas and values, and explores alternative design values. In accessibility research, critical design is used to create provocative prototypes not primarily intended…

Cursor Assistance(also: Pointer Assistance, Mouse Assistance)

Software techniques that modify cursor behavior to make pointing and clicking easier for users with motor impairments. Cursor assistance encompasses a range of approaches including enlarging the effective target area (area cursors, bubble cursors), making targets "sticky" so the…

Cursor Control(also: Pointer Control, Cursor Navigation)

The ability to direct and position an on-screen cursor or pointer using an input device such as a mouse, trackball, touchpad, joystick, or eye tracker. Cursor control is a fundamental requirement for interacting with graphical user interfaces and involves both gross movements…

Cursor Freeze(also: Pointer Freeze, Steady Clicks)

An assistive technology technique that locks the cursor position in place during mouse button clicks, preventing the cursor from moving between the press and release of the button. This addresses a common source of errors for users with motor impairments who may involuntarily…

Cyborg(also: Cybernetic Organism)

A being that integrates both organic and technological components, extending human capabilities through mechanical or digital augmentation. In disability studies and accessibility research, the cyborg concept has been applied to understand how people with disabilities who use…

24 results.