Glossary

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Intelligent Home System(also: IHS, Smart Home System, Ambient Assisted Living System)

A technology-enhanced living environment that uses sensors, actuators, and computing to monitor conditions and provide automated or voice-activated support for daily activities, particularly for older adults and people with disabilities who wish to live independently.…

Intelligent Personal Assistant(also: IPA, Virtual Assistant, AI Assistant)

A software agent that uses natural language processing and speech recognition to perform tasks, answer questions, and control devices on behalf of a user. Examples include Amazon Alexa, Google Assistant, Apple Siri, and Microsoft Cortana. While intelligent personal assistants…

Intelligent Tutoring System(also: ITS, AI Tutor)

An AI-powered educational system that provides personalized instruction, feedback, and scaffolding adapted to individual learners' needs, knowledge levels, and learning patterns. Modern intelligent tutoring systems increasingly use generative AI and large language models to…

Intelligent Virtual Assistant(also: IVA, Virtual Assistant, AI Assistant)

A software-based agent that uses artificial intelligence, natural language processing, and speech recognition to understand and respond to human voice or text commands. Intelligent Virtual Assistants such as Amazon Alexa, Google Assistant, and Apple Siri are embedded in smart…

Intelligent Wheelchair(also: Smart Wheelchair, Powered Wheelchair with Navigation Assistance)

A powered wheelchair augmented with sensors, computing hardware, and software algorithms to provide navigation assistance, collision avoidance, or autonomous driving capabilities. Intelligent wheelchairs range from fully autonomous systems that navigate without user input to…

Intelligent agent(also: Software agent, Autonomous agent)

An autonomous computer program or algorithm that acts on behalf of another entity, typically a user. Intelligent agents work to a set of rules that may evolve over time based on experience. In accessibility, intelligent agents can observe user behaviour and adapt interfaces…

Intensive Care Unit(also: ICU, Critical Care Unit)

A specialized hospital department that provides continuous monitoring and life-support treatment for patients with severe or life-threatening conditions. ICU patients frequently experience temporary communication disabilities due to intubation, sedation, or physical weakness,…

Intention Tremor(also: Cerebellar Tremor, Action Tremor)

A type of tremor that appears or worsens during voluntary, goal-directed movement — particularly as a limb approaches its target — and is typically absent at rest. Intention tremor is most often caused by damage to the cerebellum or its pathways (multiple sclerosis, stroke,…

Intention-Based Description(also: Intention-Based Graph Description, Purpose-Driven Description)

An approach to generating accessible descriptions of visual content (particularly graphs and data visualisations) that focuses on communicating what the creator intended to convey rather than exhaustively describing every visual element. In graph accessibility, intention-based…

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…

Inter-Annotator Agreement(also: IAA, Inter-rater agreement, Inter-coder agreement)

A statistical measure of how consistently two or more human annotators assign the same label to the same data item, widely used in NLP, computer vision, and AI dataset construction as a proxy for label quality. Common measures include Cohen's kappa, Fleiss' kappa, and…

Inter-Icon Spacing(also: Icon Spacing, Icon Gap)

The amount of empty space between icons or interactive targets in a graphical user interface. Inter-icon spacing affects a user's ability to visually distinguish, locate, and accurately select individual icons, particularly for people with visual impairments or motor…

Inter-Rater Reliability(also: Inter-Coder Reliability, Inter-Annotator Agreement, IRR)

A statistical measure of the degree to which two or more independent raters or coders agree in their assessments or classifications of the same data. In accessibility research, inter-rater reliability is used to validate qualitative coding of user study data, annotation of…

Interaction Analysis

A qualitative research method for studying knowledge and action in interaction with people, objects, and environments — typically through close observation of video or screen recordings, annotating visible affect, body language, utterances, and moment-by-moment behavior.…

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…

Interaction Logging(also: Event Logging, User Interaction Logging, UI Event Logging)

The automated capture and recording of user interface events — such as clicks, keystrokes, focus changes, touch gestures, and scrolling — during a person's interaction with a digital system. In accessibility research and evaluation, interaction logging is valuable for…

Interaction Paradigm(also: Interaction Method, Input Paradigm)

A model or approach for how users interact with a system, encompassing the input devices, techniques, and patterns of engagement. In VR, common interaction paradigms include controller-based input, hand tracking, gaze-based interaction, and voice commands. Each paradigm has…

Interaction Shell

A software component that renders user interface elements in a specific modality and handles direct interaction with the user. In the Fruit toolkit architecture, the interaction shell is separated from the application logic, allowing different shells (GUI, character-screen,…

Interaction Symmetry(also: Balanced Interaction)

The degree to which conversation partners have equal opportunities and means to participate in an interaction. In face-to-face spoken conversation, interaction is relatively symmetric—both partners can speak, listen, and use non-verbal cues at comparable speeds. AAC…

Interaction metaphor

A conceptual mapping that allows users to understand and interact with a digital interface by drawing on familiar experiences or mental models. Common examples include the desktop metaphor (files, folders, trash can), direct manipulation (dragging objects), and the page metaphor…

Interaction with Disabled Persons Scale(also: IDP Scale, IDP)

A standardized 20-item attitudinal instrument developed by Gething and Wheeler (1992) and later validated by Forlin, Fogarty, and Caroll (1999), designed to measure both desirable and undesirable emotions that people experience when interacting with individuals who have…

Interactional Synchrony

The coordinated, often unconscious alignment of conversational partners' body postures, gestures, gaze, vocal rhythm, and facial expressions during social interaction. Research in social psychology and affective neuroscience has linked interactional synchrony to rapport,…

Interactive 3D Printed Model(also: I3M, Interactive Tactile Model)

A 3D printed physical object augmented with technology that provides audio or other non-visual feedback when users touch or interact with specific areas. These models combine the tangible spatial information of a physical replica with digital annotations, typically using…

Interactive Communication Model

A model of communication that extends the linear model by incorporating feedback from the receiver back to the sender, creating a two-way exchange. In AAC contexts, interactive high-tech devices enable the AAC user to receive responses and adjust their communication accordingly,…

Interactive Dance(also: Interactive Dance Performance, Digital Dance)

A performance genre in which dancers' movements, physiology, or prop interactions are captured in real time (via motion capture, biosensors, or sensor-equipped objects) and used to drive digital visual or audio output — most commonly projected backdrops, lighting effects, or…

Interactive Description(also: Dynamic Description)

A design approach for providing accessible descriptions of interactive digital content that updates in real time as users navigate and manipulate elements. Unlike static alternative text, interactive descriptions consist of two complementary structures: state descriptions that…

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,…

Interactive Television(also: iTV, Interactive TV)

Interactive television (iTV) refers to television systems that allow viewers to interact with content beyond simply watching, through features such as voting on polls, accessing supplemental information, navigating menus, and using applications displayed on the TV screen. iTV…

Interactive Voice Response(also: IVR, Voice Response System)

A telephony technology that allows users to interact with automated systems using voice commands or keypad input. IVR systems are particularly valuable for accessibility in low-income settings because they work with any phone (including basic feature phones), require no internet…

Interaural Level Difference(also: ILD, Interaural Intensity Difference, IID)

The difference in sound pressure level (loudness) between the two ears, used by the auditory system to localize sound sources. Sounds coming from the right are louder in the right ear due to the head creating an acoustic shadow. ILD is most effective for localizing…

Interaural Time Difference(also: ITD, Interaural Phase Difference)

The difference in arrival time of a sound between the two ears, used by the auditory system to localize sound sources in the horizontal plane. Sound from the left reaches the left ear before the right ear; the brain uses this timing difference (up to about 0.6-0.7 milliseconds…

Interdependence(also: Relational autonomy)

A framework in disability studies that recognises all people — disabled and non-disabled — as fundamentally reliant on others and on social infrastructure, challenging the Western ideal of individual independence as the highest form of agency. In accessibility design,…

Interdependence Framework(also: Interdependence in Assistive Technology)

A theoretical framework in assistive technology design that challenges the traditional emphasis on individual independence as the primary goal of accessibility. The Interdependence Framework, introduced by Bennett et al., positions assistive technologies as emerging from mutual…

Interdependent Accessibility(also: Interdependence Framework, Access Interdependence)

A framework for understanding accessibility as a collective, co-created responsibility rather than an individual accommodation. Interdependent accessibility recognizes that access is produced through relationships and collaboration between disabled and non-disabled people,…

Interest-Based Personalisation(also: Interest-Based Customization, Special Interest Embedding)

A software design strategy in which content, visuals, or activities are customised to reflect a user's personal interests or preferences in order to increase engagement and motivation. In the context of autism and developmental disabilities, interest-based personalisation…

Interface Complexity(also: UI Complexity)

The degree of intricacy in a user interface, encompassing the number of elements, depth of navigation, variety of interaction patterns, and cognitive load required to accomplish tasks. For blind and low vision users, interface complexity is a significant accessibility barrier…

Interface Consistency(also: Consistent Navigation, Consistent Identification, UI Consistency)

Interface consistency is a design principle requiring that navigational mechanisms, visual layouts, and interactive components appear and behave in the same way across different pages, screens, or applications. In accessibility, consistency is critical because users who rely on…

Interface Personalisation(also: Interface Personalization, UI Personalisation, Adaptive Interface)

The ability for users to configure and customise the user interface of a digital system to match their individual needs, preferences, and abilities. In accessibility contexts, interface personalisation allows users to adjust settings such as text size, colour schemes, audio…

Intergenerational Communication(also: Cross-generational Communication)

Communication between people of different generations, particularly between older adults and younger family members or caregivers, which can be complicated by differing expectations, technology literacy levels, and communication styles. In accessibility and aging contexts,…

Intergenerational Design(also: Cross-Generational Design)

A design approach that considers the needs, preferences, and interaction patterns of users across different age groups and generations. Intergenerational design aims to create products and experiences that facilitate meaningful engagement between younger and older users rather…

Intergroup Contact Theory(also: ICT, Contact Hypothesis)

A social-psychology theory, originating with Gordon Allport's 1954 contact hypothesis and elaborated by Pettigrew, Tropp, and others, which holds that positive, meaningful interaction between members of different social groups reduces prejudice and increases acceptance —…

Interlingua(also: Interlingual Representation, Interlingual MT)

In machine translation, a language-neutral semantic representation that serves as an intermediate form between the source and target languages. An interlingual MT system first analyses the source text into this representation and then generates the target text from it, so the…

Intermedia(also: Intermedia Representation)

Intermedia refers to a framework for information representation that supports diverse, adaptable, and flexible presentation modes, allowing the same content to be accessed through multiple alternative forms suited to individual needs and capabilities. Unlike multimedia (which…

Intermediated Technology Use(also: Intermediated Interaction, Assisted Technology Use)

A pattern of technology interaction where a person accesses technology through the assistance of another person (an intermediary) rather than using it directly themselves. This occurs when barriers such as cost, literacy, disability, or lack of access prevent direct use. Common…

Internal Access Conflict(also: Conflicting Access Needs)

A situation where a single individual's different access needs contradict or undermine each other, making it impossible to fully accommodate all needs simultaneously. For example, a person with chronic illness may benefit from remote meetings to avoid physical exertion, but the…

Internal Reliability(also: Internal Consistency)

A psychometric property that measures whether all items in a questionnaire or instrument contribute consistently to the overall score. It is commonly assessed using Cronbach's alpha, where values of 0.7 and above are generally considered acceptable. In accessibility research,…

Internalized Ableism(also: Internal Ableism, Self-Ableism)

The process by which disabled individuals absorb and internalize society's negative attitudes, stereotypes, and devaluation of disability, leading to feelings of shame, self-doubt, or a desire to hide or overcome their disability. Internalized ableism can cause disabled people…

Internalized Ageism(also: Self-Directed Ageism)

The process by which older adults absorb and accept negative societal stereotypes about aging, applying these beliefs to themselves and their peers. Internalized ageism can lead older adults to underestimate their own capabilities, avoid learning new technologies, or accept…

Internalized stigma(also: Self-stigma, Internalized ableism)

The process by which individuals with disabilities or neurodivergent conditions absorb and internalize negative societal attitudes about their condition, leading to shame, reduced self-worth, and reluctance to seek support. Internalized stigma can manifest as viewing one's…

Internationalization(also: i18n)

The process of designing and developing software, websites, or applications so that they can be adapted to different languages, regions, and cultural conventions without requiring engineering changes. Internationalization involves architectural decisions such as supporting…