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Adaptive Technology

Technology that has been modified or adapted from its original design to be accessible to people with disabilities, as distinct from assistive technology which is purpose-built for disability access. Examples include modified keyboards, adapted game controllers, or software with…

Adaptive Technology Resource Centre(also: ATRC, Inclusive Design Research Centre)

The Adaptive Technology Resource Centre (ATRC) was a research centre at the University of Toronto dedicated to developing inclusive information technology and promoting digital accessibility. Founded in the 1990s, the ATRC became one of the most influential accessibility…

Adaptive Typography(also: Context-Aware Typography, Dynamic Typography)

The practice of adjusting text presentation - font size, weight, line spacing, character spacing, contrast, and colour - automatically or semi-automatically in response to the user's current needs and context. Adaptive typography goes beyond static accessibility settings by…

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

A user interface that automatically modifies its behavior, presentation, or content based on observed user characteristics, interaction patterns, or context of use. In accessibility, adaptive interfaces can detect when a user is experiencing difficulty — through patterns like…

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

A user interface that automatically detects changes in user behavior or ability and adjusts its presentation or functionality accordingly, without requiring the user to manually configure settings. In accessibility, adaptive user interfaces can monitor pointing performance…

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

A user interface that automatically adjusts its presentation, behavior, or content based on user characteristics, preferences, context, or interaction patterns. Unlike customizable interfaces where users manually configure settings, adaptive interfaces use algorithms to detect…

Adaptive content(also: Content adaptation, Adaptive hypermedia)

Content that automatically adjusts its presentation, structure, or level of detail based on the needs, preferences, or capabilities of the user or their device. In accessibility, adaptive content goes beyond responsive design (which adjusts layout) to potentially restructure…

Adaptive content complexity(also: Layered descriptions, Tiered content)

A design strategy that provides the same information at multiple levels of detail or complexity, allowing users to access content appropriate to their cognitive processing capacity, prior knowledge, or current needs. For example, a system might offer simple, medium, and detailed…

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…

Adherence(also: Treatment Adherence, Exercise Adherence, Compliance)

The extent to which a person follows prescribed medical treatments, exercise routines, or therapy programs. In physical therapy and rehabilitation, adherence is often framed as an individual responsibility, with non-adherence viewed as patient failure. However, accessibility…

Administrative Burden(also: Bureaucratic Burden, Process Burden)

The cumulative effort, time, stress, and negative impacts that result from navigating administrative processes such as applying for benefits, gaining medical evidence, completing forms, and interacting with multiple organisations to achieve a particular goal. For disabled…

Adobe Acrobat(also: Acrobat Pro, Adobe Acrobat Pro, Acrobat DC)

Adobe's commercial software suite for creating, editing, and managing PDF documents, including accessibility remediation features. Acrobat Pro includes tools for adding tags to PDF documents, setting reading order, editing document structure through a tag tree, running…

Adobe Flash(also: Flash Player, Flash, Macromedia Flash)

A discontinued multimedia software platform formerly used to create animations, rich internet applications, games, and video players embedded in web pages. Flash content was notoriously inaccessible to screen readers and other assistive technologies because the Flash Player…

Adult ADHD Self-Report Scale(also: ASRS, ASRS-v1.1, Adult ADHD Self-Rating Scale)

A short self-report screening instrument for adult Attention-Deficit/Hyperactivity Disorder developed by the World Health Organization in collaboration with researchers from Harvard Medical School. The most widely used version, ASRS-v1.1, is an 18-item questionnaire whose first…

Advanced Driver Assistance Systems(also: ADAS)

A family of in-vehicle technologies that partially automate driving tasks — adaptive cruise control, lane-keeping, automatic emergency braking, parking assistance, blind-spot monitoring — while a human driver retains overall control. ADAS are relevant to accessibility as steps…

Adventitious blindness(also: Acquired blindness, Late blindness, Acquired visual impairment)

Vision loss that occurs after a period of sighted experience, as opposed to congenital blindness (present from birth). People with adventitious blindness retain visual memories, mental imagery, and familiarity with visual concepts like color and spatial layout, which…

Adversarial Stakeholders

Individuals, institutions, or systems that disabled people depend on for access but that simultaneously pose threats of harm. Examples include healthcare providers who discriminate based on stigmatized identities, government agencies that condition benefits on compliance, or…

Advocacy Labor(also: Accessibility Advocacy Labor, Corrective Labor)

The unpaid effort that disabled people must expend to correct biased, ableist, or inaccessible technology outputs and advocate for better representations of disability. In the context of generative AI, advocacy labor includes correcting stereotypical portrayals of disabled…

Aesthetic Blindness

Aesthetic blindness is a myth and misconception rooted in ableism that assumes blind people cannot perceive, appreciate, or create beauty because beauty is rendered solely through visual means. This assumption has historically led to the exclusion of blind and low vision people…

Aesthetic Experience(also: Aesthetic Need, Aesthetic Accessibility)

The emotional, sensory, and imaginative enjoyment people derive from environments, art, media, and everyday scenes - distinct from functional or task-oriented information. Aesthetic accessibility argues that blind, low-vision, Deaf, and cognitively disabled users should have…

Aesthetic Feedback(also: Visual Aesthetic Feedback)

Information provided to a user about the aesthetic qualities of visual content, such as clarity, framing, color balance, mood, lighting, and overall style. For blind creators, aesthetic feedback from AI systems can describe subjective visual qualities that would otherwise be…

Affective Captions(also: Affective Captioning, Emotive Captions)

Captions that convey not only the spoken words but also the emotional qualities of speech — such as valence (positive vs. negative tone) and arousal (intensity) — typically through typographic modulations like font-color, font-weight, or font-size, and increasingly through…

Affective Computing(also: Emotion AI, Emotional AI)

A field of AI that attempts to detect, interpret, and simulate human emotions using technologies such as facial expression analysis, voice tone detection, physiological sensors, and behavioral patterns. Affective computing raises significant accessibility and ethics concerns…

Affective Congruency

The degree to which a system's sensory outputs, interactions, and feedback align emotionally with the user's current affective state and the emotional meaning the user attaches to the experience. Distinct from perceptual congruency, affective congruency concerns whether the…

Affective Engagement(also: Emotional Engagement)

The emotional connection and investment a user develops with a task, activity, or technology. In accessibility and therapeutic contexts, affective engagement goes beyond usability to encompass motivation, enjoyment, and emotional safety. Research shows that affective engagement…

Affective Haptics(also: Emotional Haptics)

A subfield of haptic interaction design concerned with using tactile and kinaesthetic feedback — vibration, pressure, temperature, squeezing, stroking, heartbeat-like pulsation — to communicate, evoke, or regulate emotion. Affective haptics draws on research showing that touch…

Affective Lability(also: Mood Lability, Emotional Lability)

A pattern of rapid, unpredictable shifts in emotional state, often involving intense fluctuations between positive and negative moods with minimal external provocation. Affective lability is commonly associated with ADHD, bipolar disorder, and borderline personality disorder,…

Affective Touch(also: Social Touch, Emotional Touch)

The emotional and social dimension of touch, distinct from discriminative touch that identifies object properties. Affective touch is mediated primarily by C-tactile (CT) afferents in hairy skin and plays a fundamental role in social bonding, emotional communication, and…

Affinity Diagram(also: Affinity Diagramming, KJ Method)

A collaborative analysis method where team members organise large amounts of data — such as user research findings, design ideas, or usability issues — by writing individual items on sticky notes and grouping them on a wall or board according to their natural relationships and…

Affinity Diagramming(also: Affinity Mapping, KJ Method)

A qualitative data analysis and design method where researchers or team members organize individual data points (observations, quotes, ideas) into groups based on natural relationships and themes. In accessibility research, affinity diagramming is commonly used to synthesize…

Affirmative Consent(also: Yes Means Yes)

A consent model that requires explicit, active agreement to an action - typically framed as 'yes means yes' rather than the absence of refusal. Originating in sexual-violence prevention and adopted in HCI work on consent technology, affirmative consent emphasises that silence,…

Affirmative Model of Disability(also: Affirmation Model)

A disability framework that goes beyond the social model by acknowledging disabled individuals's lived experiences and emphasizing their abilities, strengths, and unique perspectives rather than limitations. The affirmative model celebrates disability as a positive identity,…

Affordable Assistive Technology(also: Low-Cost AT, Frugal Assistive Technology)

Assistive devices and technologies designed to be financially accessible to people with disabilities in low-resource settings, where the cost of commercially available assistive technology from the Global North is often prohibitive. Affordable AT leverages local fabrication…

Affordance(also: Perceived affordance)

A property of an object or environment that suggests how it can be used, originally defined by psychologist James J. Gibson in 1977 as the actionable possibilities between an actor and their environment. In design, Donald Norman popularised the concept to describe how visual and…

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…

Age-Friendly Design(also: Design for Aging, Senior-Friendly Design)

An approach to designing products, services, and environments that accommodates the needs and capabilities of older adults, including those experiencing age-related changes in vision, hearing, cognition, and motor skills. Age-friendly design overlaps significantly with…

Age-Related Accessibility(also: Aging and Accessibility, Older Adult Accessibility)

The design considerations and accommodations needed to ensure digital technology is usable by older adults who experience age-related changes in vision, hearing, cognition, and motor control. Common challenges include reduced visual acuity and contrast sensitivity, narrowed…

Age-Related Capability Decline(also: Age-Related Impairment, Dynamic Diversity)

The gradual reduction in sensory, motor, and cognitive capabilities that typically accompanies ageing, including declining visual acuity, hearing loss, reduced dexterity and fine motor control, and changes in memory and processing speed. Unlike many disabilities that are stable…

Age-Related Changes(also: Aging Effects, Age-Associated Decline)

Physical, sensory, and cognitive changes that occur naturally as people age, affecting how they interact with technology. Common changes include reduced visual acuity, hearing loss, decreased motor control, slower processing speed, and changes in working memory. However,…

Age-Related Decline(also: Age-Related Impairment, Age-Related Changes)

The gradual reduction in physical, sensory, and cognitive abilities that occurs as part of the natural aging process. Age-related declines that affect technology use include reduced visual acuity (difficulty reading small text and icons), decreased fine motor control (difficulty…

Age-Related Dexterity Changes(also: Motor Decline in Aging, Age-Related Motor Impairment)

The gradual decline in fine motor control, hand-eye coordination, and manual dexterity that commonly occurs with aging, affecting the ability to use input devices like mice, keyboards, and touchscreens. These changes are caused by factors including reduced spatial abilities,…

Age-Related Functional Limitations(also: Ageing-Related Accessibility Needs, Age-Related Impairments)

The gradual changes in sensory, motor, and cognitive abilities that commonly occur with ageing, including declining vision, hearing loss, reduced dexterity and fine motor control, and changes in memory and processing speed. These functional limitations often overlap…

Age-Related Impairment(also: Age-Related Decline, Aging-Related Disability)

Functional limitations that commonly develop with advancing age, often involving multiple interacting mild impairments rather than a single major disability. Age-related impairments may affect vision (presbyopia, reduced contrast sensitivity, cataracts), hearing (presbycusis),…

Age-Related Vision Loss(also: Age-Related Visual Impairment)

Vision impairment that occurs as a consequence of aging, representing the most common cause of blindness and low vision worldwide. Conditions include age-related macular degeneration, glaucoma, diabetic retinopathy, and cataracts. The prevalence of significant visual impairment…

Age-Sensitive Design(also: Age-Sensitive Creative AI Mediation)

A design stance that treats age-related physical, cognitive, and digital-literacy characteristics as first-class inputs to the system design process rather than as edge cases to be handled after the fact. For interactive and AI-supported tools, age-sensitive design typically…

Age-friendly design(also: Senior-friendly design, Gerontechnology design)

A design approach that specifically addresses the perceptual, cognitive, and motor changes associated with aging, including larger fonts, simplified interfaces, reduced jargon, higher contrast, and minimized demands on working memory and perceptual speed. Research shows that…

Age-related Differences(also: Age Effects, Generational Differences)

The systematic variations in technology use, learning strategies, and task performance that occur across different age groups. Research consistently shows older adults take 1.5 to 2 times longer than younger adults on technology tasks even when achieving equal accuracy, due to…

AgeTech(also: Age tech, Technology for older adults)

A broad category of technology designed to support older adults in aging well, living independently, and managing age-related health conditions. AgeTech spans smart-home monitoring, voice assistants, medication reminders, fall-detection wearables, social companion robots,…

Ageing in Place(also: Aging in Place)

The ability of older adults to live independently and safely in their own home and community for as long as possible, regardless of age, income, or ability level. Ageing in place is increasingly promoted as an alternative to institutional care, supported by technologies such as…

Ageism(also: Age Discrimination, Age Bias)

Stereotyping, prejudice, and discrimination against people based on their age, most commonly directed at older adults. Ageism manifests at individual, institutional, and societal levels through assumptions about cognitive decline, technology incompetence, resistance to change,…