Glossary

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Input Adaptation(also: Input Device Adaptation, Input Modality Adaptation)

The process of automatically or manually modifying an application's user interface to work with input devices or methods it was not originally designed for. Input adaptation addresses the fact that most graphical user interfaces are designed for keyboard and mouse, yet many…

Input Exertion(also: Input Effort, Interaction Cost)

The physical and cognitive effort required to provide input to a digital system, including keystrokes, mouse movements, taps, and voice commands. For people with motor impairments, input exertion is a critical accessibility concern because even small inefficiencies — such as…

Input Logging(also: Keystroke Logging, Input Event Logging)

The practice of recording detailed timestamped data about keyboard and mouse events — including key presses, releases, mouse movements, clicks, and button states — for analysis of user interaction patterns. In accessibility research, input logging is used to study the…

Input Method Editor(also: IME, Input Method)

A software component that allows users to enter characters and symbols not directly available on their physical keyboard, particularly for languages with large character sets or complex scripts. IMEs are essential for typing in languages like Chinese, Japanese, Korean, and…

Input Modality(also: Interaction Modality, Input Method)

A distinct channel or method through which a user provides input to a computing system, such as touch, voice, gesture, gaze, or keyboard interaction. In accessibility contexts, supporting multiple input modalities is critical because users with different disabilities may need…

Input Rate(also: Keystroke Rate)

The speed at which a user can produce individual keystrokes or character inputs, typically measured in seconds per keystroke. Input rate varies dramatically across access methods: touch typists may achieve 0.1-0.2 seconds per keystroke, while users of switch scanning systems or…

Input Redundancy

A design principle that provides multiple alternative ways to accomplish the same input action, ensuring that users can interact with a system regardless of their specific abilities. In VR accessibility, input redundancy means offering controller input alongside hand tracking,…

Insertion Error(also: Missing Text Error)

A type of text error where content that should be present is missing, requiring the user to navigate to the correct position and add the missing characters, words, or phrases. Insertion errors are challenging for blind users because determining the exact cursor position for…

Inspiration Porn

The portrayal of people with disabilities as inspirational solely or primarily because of their disability, objectifying them for the benefit of non-disabled audiences. Coined by disability activist Stella Young, inspiration porn reduces disabled people to motivational props and…

Instance Segmentation

A computer vision technique that identifies and delineates individual objects within an image at the pixel level, distinguishing separate instances even when they belong to the same category. In accessibility contexts, instance segmentation enables assistive tools to provide…

Instance-Level Recognition(also: Instance Recognition, Fine-Grained Recognition)

A computer vision task that involves distinguishing between specific individual objects within the same general category, rather than just identifying broad categories. For example, while category-level recognition might identify something as "a bag of chips," instance-level…

Institutional Ableism(also: Systemic Ableism, Structural Ableism)

Prejudice and discrimination against people with disabilities that is embedded in the policies, practices, norms, and culture of organizations and institutions, rather than manifesting solely through individual attitudes. In higher education, institutional ableism appears in…

Institutional Barriers(also: Organizational Barriers, Systemic Barriers)

Obstacles to accessibility, technology adoption, or inclusion that arise from organizational policies, practices, norms, and cultures rather than from individual limitations or technology design. In schools for the blind, institutional barriers include management resistance to…

Institutional Gatekeeping(also: Systemic Gatekeeping)

The practices through which institutions such as insurance companies, healthcare providers, school districts, and government agencies control access to assistive technology and disability services by defining eligibility criteria, evaluation processes, and funding boundaries.…

Institutionalization

The historical and ongoing practice of placing disabled people in segregated residential facilities such as asylums, nursing homes, and other care institutions, often without their consent. Institutionalization became the default approach to disability in the United States in…

Instructional Technology(also: Educational Technology, EdTech)

Digital technologies intentionally designed and used for teaching and learning purposes, including learning management systems (Google Classroom, Canvas), educational software (Khan Academy, MyMathLab), student response systems (Kahoot), digital textbooks, and assessment…

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: IADLs)

Complex everyday tasks that require higher-level cognitive and physical skills than basic self-care activities. IADLs include managing finances, shopping, meal preparation, housekeeping, laundry, using transportation, managing medications, and using communication technologies…

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…

Integrated Control System(also: Integrated Control)

An assistive technology approach where a single input device serves multiple control functions, such as wheelchair navigation, mouse cursor control, and text entry. Integrated control systems reduce the number of separate devices a person with a disability must manage, lowering…

Integrated Development Environment(also: IDE)

A software application that provides comprehensive facilities for programming, typically combining a source code editor, build automation tools, a debugger, and often version control integration in a single interface. IDEs like Visual Studio Code, Eclipse, and IntelliJ IDEA are…

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…

Intellectual and Developmental Disability(also: IDD, Intellectual Disability, Developmental Disability)

A group of conditions characterised by significant limitations in both intellectual functioning (reasoning, learning, problem-solving) and adaptive behaviour (everyday social and practical skills), with onset during the developmental period. IDD encompasses a wide range of…

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…