Glossary

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Iconography(also: Icon Design, Icon System)

The design and systematic use of visual symbols to convey meaning in an interface. Good iconography balances recognisability, consistency, and cultural appropriateness so that users can interpret symbols quickly without reading text. For accessibility, icons alone are rarely…

Illiteracy(also: Functional Illiteracy, Low Literacy)

The inability to read or write, or having reading and writing skills below a functional level needed for everyday tasks. In the context of digital accessibility, illiteracy and low literacy present significant barriers to using text-based interfaces, navigating websites,…

Image-Based Interface(also: Photo-Based Interface, Picture-Based Interface)

A user interface design approach that uses photographs, icons, or other visual images as the primary means of interaction and identification, minimizing or eliminating the need for text. Image-based interfaces are particularly valuable for users with cognitive disabilities, low…

Immersive Analytics(also: 3D Data Visualisation, Spatial Analytics, Immersive Visualisation)

Immersive analytics is the application of interactive 3D, virtual reality (VR), or augmented reality (AR) technologies to support data exploration, analysis, and decision-making. By leveraging spatial context, immersive analytics aims to overcome the limitations of flat 2D…

Immersive Storytelling(also: Interactive Narrative, VR Storytelling)

A narrative approach that places users inside a story environment, allowing them to experience and interact with the narrative through spatial presence, sensory engagement, and active participation. In therapeutic and accessibility contexts, immersive storytelling can scaffold…

Impostor Syndrome(also: Impostor Phenomenon, Impostorism)

A psychological pattern in which individuals doubt their accomplishments and fear being exposed as fraudulent despite evidence of competence. For people with disabilities, impostor syndrome is often intensified by ableist institutional structures: accommodations may be…

In-situ Highlighting(also: In-situ Guidance, In-situ Instruction, On-screen Highlighting)

In-situ highlighting is a tutorial technique that overlays visual indicators directly on the live application interface to show the user exactly where to tap, look, or interact next - rather than describing the action in a separate text or video tutorial. Common implementations…

Inattentional Blindness(also: Perceptual Blindness)

Inattentional blindness is the failure to notice a fully visible but unexpected object or feature when attention is directed elsewhere. It is distinct from change blindness (failure to notice a change between two views): inattentional blindness is about missing something that…

Independent Living(also: Autonomous Living)

A philosophy and practical goal emphasizing that people with disabilities should have the same opportunities and control over their daily lives as people without disabilities, including making choices about where and how they live. In accessibility practice, independent living…

Information Appliance(also: Smart Appliance, Dedicated Device)

A computing device designed for a specific, well-defined purpose that is communication-oriented and easy to use, in contrast to a general-purpose computer. Information appliances typically have reduced functionality and complexity compared to desktop or laptop computers, making…

Information Foraging(also: Information Foraging Theory)

A theoretical framework from cognitive science that models how people search for and navigate to information, drawing an analogy to animal foraging behaviour. Users assess "information scent" — cues like link text, headings, and page structure — to decide whether to continue…

Information Overload(also: Cognitive Overload, Information Overwhelm)

The state of being overwhelmed by the volume of information presented, making it difficult to identify relevant content, make decisions, or complete tasks effectively. In web accessibility contexts, information overload disproportionately affects screen reader users who must…

Information Scent(also: Information Smell)

A concept from information foraging theory that describes the strength of cues in a user interface that indicate whether a particular path (link, button, menu item) will lead to desired information or functionality. Strong information scent means users can easily predict what…

Information Seeking(also: Information Retrieval Behavior, Information Search)

The process of actively looking for specific information to answer a question, complete a task, or satisfy an information need. Information seeking on the web involves formulating queries, navigating search results, scanning pages for relevant content, and synthesizing…

Information chunking(also: Chunking)

The practice of organizing information into smaller, manageable groups or segments to reduce cognitive load and improve comprehension and retention. Rooted in cognitive psychology research on working memory limitations, chunking is essential for accessible content design —…

Inhibitory Control(also: Response Inhibition, Impulse Control)

The executive function that enables a person to suppress automatic or impulsive responses in favor of more appropriate, goal-directed behavior. Inhibitory control is essential for tasks requiring sustained focus, turn-taking, and resisting distractions. It is commonly affected…

Instructional design(also: Learning design)

The systematic process of creating educational or instructional materials and experiences that facilitate effective learning and task completion. In accessibility, instructional design principles ensure that tutorials, product manuals, help documentation, and learning materials…

Instrumental Activities of Daily Living(also: IADL, IADLs)

Complex daily tasks that require higher-order cognitive and organizational skills beyond basic self-care. IADLs include managing finances, shopping, preparing meals, housekeeping, using transportation, managing medications, and using communication devices. The Lawton IADL Scale…

Intellectual Disability(also: ID, Intellectual Development Disorder)

A disability characterized by significant limitations in intellectual functioning (reasoning, learning, problem-solving) and adaptive behavior (everyday social and practical skills), originating during the developmental period. Intellectual disability exists along a continuum…

Intellectual Disability(also: ID, Cognitive Disability, Learning Disability (UK))

A disability characterized by significant limitations in intellectual functioning (reasoning, learning, problem-solving) and adaptive behavior (conceptual, social, and practical skills) that originates before age 22. Intellectual disabilities exist on a spectrum from mild to…

Intellectual Disability(also: ID, Learning Disability (UK), Cognitive Disability)

A condition characterized by significant limitations in both intellectual functioning (reasoning, learning, problem-solving) and adaptive behavior (conceptual, social, and practical skills) that originates before age 22. The DSM-5 and ICD-11 classify severity levels based on…

Intentional Sensory Stimulation

A design approach for technology that deliberately leverages optimal sensory modes — visual, auditory, haptic, or multimodal — to facilitate comprehension and engagement, rather than simply reducing interface complexity. Introduced in the context of dementia accessibility…

Interaction Framing(also: Narrative Framing, Framing (Interaction Design))

Interaction framing refers to the way a system positions the user's role and the meaning of their input, independent of the underlying mechanics. The same choice can be framed as completing a task ("select the appropriate response") or as taking a meaningful action inside a…

Interactive Task Guidance(also: Task Guidance System, Step-by-Step Task Support, Task Prompting)

Interactive task guidance is a form of cognitive assistive technology that provides real-time, step-by-step instructions to help individuals with cognitive impairments complete multi-step daily activities. Unlike simple reminder systems that only alert users to start a task,…

Intrinsic Cognitive Load(also: Intrinsic Load)

One of three types of cognitive load identified by cognitive load theory, referring to the inherent difficulty of the material being learned based on its complexity and the learner’s prior knowledge. Intrinsic cognitive load is determined by the number of elements that must be…

Italic Font Style(also: italics, oblique)

A slanted or cursive-style variant of a typeface, traditionally used for emphasis, titles, or foreign words. Eye-tracking research demonstrates that italic fonts create significant accessibility barriers—Arial Italic, for example, showed the worst reading performance across…

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