Glossary

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Above the Fold(also: Above-the-fold, First Screen Content)

Content that is visible on a web page without requiring the user to scroll. The term originates from newspaper publishing where important headlines appeared above the physical fold of the paper. In digital accessibility and usability, above-the-fold placement is significant…

Access Friction(also: Accessibility Friction)

The effort, frustration, or barriers encountered when attempting to access technology, services, or environments. Access friction can range from minor inconveniences to complete exclusion and may result from poorly designed interfaces, lack of accommodations, bureaucratic…

Accessibility Feature Discovery(also: Feature Discoverability, Accessibility Awareness)

The process by which users learn about, find, and activate accessibility features available on their devices or in software. Research shows that the vast majority of users — particularly older adults — are unaware of built-in accessibility features on their smartphones and…

Accessibility-in-Use(also: Accessibility in Use)

A concept describing how well accessibility metrics predict the actual effects that real accessibility problems will have on the quality of interaction as perceived by real users when interacting with real pages for achieving real goals. Unlike traditional conformance testing…

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 Hypermedia(also: AH, Adaptive Hypermedia Systems, AHS)

Interactive systems that build a model of each user's goals, knowledge, preferences, and context, then use this model to automatically adapt the content, presentation, and navigation of hypermedia documents. Unlike static web pages that present the same interface to all users,…

Adaptive Navigation(also: Adaptive Navigation Support)

A technique in which a system dynamically modifies the presentation of navigational elements (such as links, menus, or breadcrumbs) based on user characteristics, behaviour, or context. In accessibility applications, adaptive navigation can reorder, annotate, hide, or highlight…

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…

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…

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-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…

Alarm Fatigue(also: Alert Fatigue, Notification Fatigue)

A phenomenon in which an individual becomes desensitised to alarms, alerts, or notifications due to their excessive frequency, repetitive nature, or lack of meaningful context, leading the person to ignore, snooze, or dismiss them. In healthcare and medication management, alarm…

Anchoring Effect(also: Anchoring Bias, Cognitive Anchoring)

A cognitive bias in which people rely too heavily on an initial piece of information (the "anchor") when making subsequent decisions or judgements. In the context of digital accessibility, the anchoring effect has been documented in alt text authoring, where content authors who…

Assistive Technology Abandonment(also: AT Abandonment, Technology Discontinuance)

The phenomenon of users with disabilities ceasing to use an assistive technology device or system after initial adoption. Research identifies several predictors of abandonment, including failure to consider user opinions during design, lack of training, poor device performance,…

Audience Modelling(also: Audience Modeling, User Modelling)

The practice of characterizing and formally describing distinct groups of users and their interaction characteristics to inform the design and evaluation of web interfaces. In accessibility, audience modelling involves identifying the specific abilities, disabilities, devices,…

Auditory Interface(also: Audio Interface, Aural Interface, Non-Visual Interface)

A user interface that conveys information and accepts input primarily through sound rather than visual displays. Auditory interfaces range from simple screen reader output to complex auditory environments using spatial audio, earcons, speech synthesis, and sonification. In…

Auditory Satisfaction

The overall positive emotional and cognitive response users experience after engaging with audio content, encompassing contentment with auditory features, narration style, and technical quality. In accessible media research, auditory satisfaction is measured across dimensions…

Automation Confusion

A phenomenon, well documented in human–automation literature and observed in partially automated video games, in which the user struggles to distinguish the outcomes of their own actions from those performed autonomously by a software agent. In shared-control gaming this can…

Avatar(also: Virtual Self, Digital Representation, Self-Avatar)

A graphical representation of a user within a virtual environment or digital platform. Avatars can range from simple icons to fully customizable 3D virtual humans that mirror user movements. In accessibility research, avatar customization has been shown to increase engagement…

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