Glossary

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Content Management System(also: CMS)

Software that enables users to create, edit, and publish digital content — typically web pages — without requiring direct coding knowledge. Popular examples include WordPress, Drupal, and SharePoint. In the accessibility context, CMS platforms play a critical role because they…

Content Moderation(also: Content Filtering, Automated Content Moderation)

The process of monitoring and filtering user-generated content on digital platforms, increasingly performed by AI systems. Content moderation has documented negative effects on people with disabilities: automated systems have suppressed content from disabled creators (TikTok…

Content Personalization(also: Accessibility Personalization, Content Adaptation)

The practice of tailoring digital content presentation and interaction to match individual users' needs, preferences, and abilities. In accessibility, personalization goes beyond one-size-fits-all approaches by allowing users to specify how they prefer to receive information —…

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…

Content Quality(also: Information Quality)

The accuracy, reliability, completeness, and trustworthiness of information presented in digital content. For health-related and disability-related content on social media and video platforms, content quality is a critical concern because misinformation can lead to harmful…

Content Re-Rendering(also: Content Transformation, Accessible Re-Rendering)

The process of taking content from one format or presentation and transforming it into a different format that is more accessible or usable for a specific audience. In accessibility, content re-rendering typically involves converting visually-encoded information (images, PDFs,…

Content Rearrangement(also: Information Rearrangement, Content Reordering, Page Restructuring)

An accessibility technique in which the content of a web page is automatically reorganised to present the most relevant information first, based on user context, intent, or navigational history. Content rearrangement addresses the sequential nature of screen reader output by…

Content Script(also: Content Scripts)

Code injected by a browser extension that runs in the context of a specific web page, with direct access to the page's DOM via standard JavaScript APIs. Content scripts let extensions read and modify page content (including adding accessibility features such as contrast…

Content Security Policy(also: CSP)

An HTTP response header that allows web developers to restrict which sources of content (scripts, styles, images, frames, etc.) a browser will load for a given page, mitigating cross-site scripting and data injection attacks. CSP interacts with browser extensions because strict…

Content Simplification(also: Content-Level Simplification)

Simplification approaches that modify the actual informational content of text, including summarization, removal of non-essential details, and restructuring of information presentation. Content simplification goes beyond lexical and syntactic simplification (which preserve all…

Content Summarization(also: Text Summarization, Automated Summarization)

The process of condensing longer text content into shorter, focused summaries that capture the essential information. In accessibility contexts, content summarization addresses the information overload that screen reader users face when navigating verbose or redundant web…

Content Transcoding(also: Content Adaptation, Content Transformation)

The process of automatically modifying web content to make it more accessible or usable for specific users or devices. Content transcoding can involve restructuring HTML, modifying CSS styles, replacing images with text alternatives, simplifying page layouts, or converting…

Content Wants(also: Information Wants, Content Preferences)

The specific types of information that a user desires or needs from a piece of content, as opposed to information needs imposed by an external system or standard. In image accessibility research, content wants refer to the particular visual elements (objects, people,…

Content tagging(also: Structural tagging, Semantic tagging)

The process of adding structural markup to document content that identifies the role and meaning of each element. In PDF accessibility, content tagging involves marking regions of a document as paragraphs, headings, lists, tables, figures, or artifacts so that assistive…

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

The capability of a system to sense and respond to its environment without requiring explicit input from the user. In assistive technology, context-aware systems infer what a user is doing based on sensor data—such as camera images, motion sensors, or object tracking—rather than…

Context Engineering(also: Context management)

The practice, in LLM-based systems, of deliberately selecting, structuring, and injecting the information an AI model sees on each call — beyond just the user's latest message — so that outputs are grounded, relevant, and aligned with the user's actual situation. Typical context…

Context Leakage(also: chat session context bleed)

A failure mode in conversational AI systems in which information from earlier, unrelated chat sessions or turns influences the current response, producing output that blends contexts — for example, mixing VoiceOver (macOS) instructions into a JAWS (Windows) troubleshooting…

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…

Context of Use(also: Use Context, Usage Context)

The combination of users, tasks, equipment (hardware, software, and materials), and the physical and social environments in which a product or service is used. In accessibility, context of use is a critical consideration because the same website may present different barriers…

Context-Appropriate Technology(also: Appropriate Technology, Context-Appropriate AT)

Technology, particularly assistive technology, that is designed or selected to fit the specific social, economic, cultural, and environmental context in which it will be used. Context-appropriate technology considers factors such as local infrastructure, available materials,…

Context-Aware(also: Context-Aware Design, Context-Sensitive)

An approach to designing systems, content, or interfaces that adapt their behavior or output based on the context in which they are used, including the user's goals, the platform or source where content appears, environmental conditions, and user preferences. In accessibility,…

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…

Context-Free Grammar(also: CFG, Formal Grammar)

A formal system for defining the syntactic rules of a language, consisting of a set of production rules that describe how symbols can be combined to form valid expressions. In accessibility and assistive technology, context-free grammars are significant because they can be used…

Contextual Design(also: Context-Sensitive Design, Situated Design)

A design approach that grounds technology development in a deep understanding of users' actual contexts, workflows, constraints, and cultural settings, rather than designing for idealized or generic use cases. Contextual design is particularly critical for assistive technology…

Contextual Factors

The characteristics of a person, their tools, or their environment that influence experiences of access or inaccessibility. Contextual factors include identity-related factors (race, gender, class, age, language, religion, sexuality, body size), social contexts (who one is…

Contextual Inquiry(also: CI, Contextual Interview)

A user research method in which a researcher observes and interviews a participant in their natural work or living environment while they perform their typical tasks. The researcher adopts an apprentice role, watching the participant work and asking questions to understand their…

Contextual Integrity(also: CI, Contextual Privacy)

A privacy framework developed by Helen Nissenbaum that defines privacy not as secrecy but as the appropriate flow of information according to context-specific norms. According to contextual integrity, privacy is violated when information flows deviate from the norms governing a…

Contextual Learning(also: Context-Dependent Learning)

The tendency of both humans and AI systems to learn patterns and behaviours from the surrounding context rather than from abstract rules. In web development, contextual learning means that developers working on accessible codebases are more likely to produce accessible code…

Contextual Reinforcement(also: Header Reinforcement)

A technique in aural and non-visual rendering of tabular data where column headers, row labels, or other structural context is repeated alongside data values to help users understand the relationships between cells. Without contextual reinforcement, a screen reader might…

Continual Learning(also: Continuous Learning, Lifelong Learning, Never-ending Learning)

A machine learning paradigm in which models learn incrementally from new data over time while retaining previously acquired knowledge, rather than being trained once on a fixed dataset. Continual learning is relevant to accessibility because it enables AI-powered accessibility…

Continuing Bonds

Continuing bonds is a theory of grief, developed by Klass, Silverman and Nickman in the 1990s, which holds that healthy mourning often involves maintaining an ongoing relationship with a deceased or absent loved one rather than achieving closure and 'letting go'.…

Continuing Professional Development(also: CPD, Professional Development)

The ongoing process through which professionals maintain, update, and expand their knowledge and skills throughout their careers. In the context of digital accessibility, CPD programs train developers, designers, content creators, and educators on inclusive design practices,…

Continuous Input(also: Continuous Control, Analog Input)

Continuous input is any interaction technique in which the user varies a parameter smoothly along a range rather than selecting from a set of discrete options — adjusting a slider, dragging a brush, turning a dial, holding a gesture, or modulating vocal loudness. Continuous…

Continuous Integration/Continuous Delivery(also: CI/CD, Continuous Integration, Continuous Delivery)

Continuous Integration/Continuous Delivery (CI/CD) is a software development practice where code changes are automatically built, tested, and prepared for release on an ongoing basis. In accessibility practice, CI/CD pipelines can incorporate automated accessibility testing…

Continuous Motion Input(also: Gesture Typing, Swipe Input)

A text entry method where the user traces a continuous path across an on-screen keyboard, passing through the desired letters or keys without lifting their finger. This approach can be faster than discrete tapping and is particularly beneficial for users with motor impairments…

Continuous Sign Language(also: Connected Sign Language, Continuous Signing)

Sign language produced in natural, flowing sentences and discourse, as opposed to isolated individual signs. Continuous sign language includes phenomena like co-articulation (where one sign influences the formation of the next), epenthesis (insertion of transitional movements…

Continuous Sign Language Recognition(also: CSLR)

A computer vision task that involves recognizing sign language from continuous, naturally produced signing — as opposed to isolated sign recognition, which identifies individual signs in segmented clips. Continuous sign language recognition deals with the complexities of natural…

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…

Continuous Voice Control(also: Continuous Vocal Control, Proportional Voice Control)

A voice interaction paradigm in which vocal parameters such as pitch, loudness, vowel quality, and timbre are used to provide smooth, proportional, real-time control of a system, as opposed to discrete voice commands that trigger specific actions. Continuous voice control is…

Contrast Ratio(also: Color Contrast Ratio, Luminance Contrast Ratio)

A numerical measure of the difference in perceived brightness between two colors, expressed as a ratio ranging from 1:1 (no contrast) to 21:1 (maximum contrast, black on white). WCAG 2.2 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (Level…

Contrast Sensitivity

The ability to distinguish between objects and their background based on differences in luminance or color. Contrast sensitivity is distinct from visual acuity and can be reduced even when acuity is relatively preserved. People with poor contrast sensitivity may struggle to read…

Contrastive Decoding(also: Visual Contrastive Decoding, VCD)

Contrastive decoding is a technique for reducing hallucinations in large language model and multimodal AI outputs by comparing token probability distributions across different input conditions. The core principle is that tokens genuinely grounded in the input content will change…

Contrastive Learning(also: Contrastive Self-Supervised Learning)

Contrastive learning is a machine learning technique that trains models to produce vector embeddings by maximising similarity between representations of the same or augmented instance (positive pairs) while minimising similarity between representations of different instances…

Control Surface(also: Hardware Controller, Mixing Console Controller)

A control surface is a hardware device with physical knobs, sliders, and buttons that maps to the controls of a software application, most commonly a digital audio workstation (DAW). For people with visual impairments, control surfaces provide essential tactile access to…

Controlled Language(also: Controlled Natural Language, CL)

An explicitly defined restriction of a natural language that specifies constraints on vocabulary, grammar, and style to improve clarity, consistency, and machine processability of text. In accessibility, controlled language rules can be applied to improve the quality of content…

Controlled Language(also: CL, Controlled Natural Language)

A restricted subset of a natural language that limits vocabulary, grammar, and style to reduce ambiguity and improve clarity and consistency in writing. In accessibility, controlled language rules can be applied to verify and improve the quality of text alternatives for images,…

Convenience Sampling(also: Availability Sampling, Accidental Sampling)

A non-probability sampling method in which participants are selected based on their availability and willingness to participate rather than through systematic selection criteria. In accessibility research, convenience sampling often results in recruiting participants from the…

Convergence Insufficiency(also: CI)

A binocular vision disorder in which the eyes have difficulty turning inward (converging) to focus on nearby objects, causing symptoms such as double vision, eye strain, headaches, difficulty reading, and blurred vision during close work. Convergence insufficiency affects an…

Conversation Analysis(also: CA)

A qualitative research methodology that studies the sequential organization and interactional dynamics of naturally occurring talk and social interaction. Conversation analysis examines fine-grained details such as turn-taking, pauses, overlapping speech, gaze direction,…