Glossary

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Ability Assumptions(also: Ability-Based Assumptions, Normative Assumptions)

Ability assumptions are the implicit expectations that technology designers build into systems about users' physical, sensory, and cognitive capabilities. These assumptions — about how fast someone moves, their range of motion, body proportions, grip strength, speech patterns,…

Ability requirement(also: Ability demand, Interaction prerequisite)

A capability that a person must possess in order to use a technology system, created implicitly by the system's design. AI systems generate new ability requirements: voice assistants require recognizable speech production, autonomous vehicles require pedestrians to look and move…

Access Differential(also: Accessibility Gap, Access Gap)

Access differential is the gap between the access that nondisabled people experience and the access that people with disabilities experience when using the same technologies, services, or environments. Unlike a binary view of accessibility (accessible or not), access…

Accessibility Barrier(also: A11y Barrier)

Any aspect of a digital product, web page, document, or service that prevents or impedes a person with a disability from perceiving, operating, understanding, or using it on an equivalent basis to someone without that disability. Examples include missing alt text on images,…

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…

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),…

Anonymization(also: Anonymity, Anonymous Communication)

The process of concealing a person's identity when they create or share content, enabling participation in discussions about sensitive, personal, or controversial topics without fear of identification or reprisal. While anonymization is straightforward for users of written…

Artboard(also: Canvas, Slide Canvas, 2-D Canvas)

An artboard is a two-dimensional digital workspace used in presentation software (PowerPoint, Google Slides, Keynote), graphic design tools, and whiteboard applications where objects like text boxes, shapes, images, and connectors can be placed at arbitrary positions. Artboards…

Audio CAPTCHA(also: Audio HIP, Audio Human Interaction Proof)

An auditory alternative to visual CAPTCHAs, typically presenting distorted spoken letters, numbers, or words that users must transcribe. While intended as an accessible alternative for blind users, research shows audio CAPTCHAs have success rates of only 43-50% for screen reader…

Aural Interface(also: Voice Interface, Voice-Controlled Interface, Voice User Interface)

An aural interface is a user interface that relies primarily on spoken language for both input (voice commands) and output (spoken responses). Examples include Amazon Alexa, Apple Siri, and Google Assistant. While aural interfaces have become increasingly popular due to their…

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