Glossary

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Human-in-the-Loop(also: HITL)

An approach to AI system design and evaluation that incorporates human judgment, feedback, and oversight at critical points in automated processes. In accessibility contexts, human-in-the-loop methodologies involve people with disabilities and other affected communities in…

Human-like trust in AI(also: Anthropomorphic trust)

The phenomenon where users develop trust in AI systems based on their human-like qualities — such as natural voice, conversational style, emotional expressiveness, and social behaviors — rather than the system's actual functional reliability. In accessibility contexts, this…

Humanoid Robot(also: Humanoid)

A robot whose physical form approximates a human body, typically with a head, torso, two arms, and (in bipedal designs) two legs. Humanoid robots are studied in accessibility research as embodied demonstrators that can present gestures, postures, and movement sequences in ways…

Humming Interface(also: Control-by-Humming, Hum-Based Interface)

A human-computer interaction method that uses hummed pitch patterns as control signals for operating devices. In a humming interface, a pitch detection algorithm analyses the user's hummed input, segments it into discrete notes based on pitch contour (rising, falling, or flat),…

HyDE(also: Hypothetical Document Embeddings)

A query-expansion technique for retrieval-augmented generation in which an LLM is first asked to generate a hypothetical answer to the user's question, and that hypothetical answer — rather than (or alongside) the raw query — is embedded and used to search the document index.…

Hybrid Captioning(also: AI-Augmented Captioning, Blended Captioning)

A captioning approach that combines human-generated captions with AI-powered correction or enhancement to achieve higher accuracy than either method alone. Hybrid systems leverage the reliability and contextual awareness of trained human captioners while using automatic speech…

Hybrid Craft(also: Digital Craft, Computational Craft)

A making practice that combines traditional hand-craft techniques (embroidery, weaving, quilting, ceramics, woodworking) with digital fabrication tools such as computerised embroidery machines, laser cutters, or 3D printers. In accessibility and HCI research, hybrid craft is…

Hybrid Interaction(also: Multimodal Hybrid Approach)

An interaction design approach that combines multiple input and output modalities, allowing users to switch between them based on task requirements, context, and personal preferences. In accessibility research, the "voice for speed, screen for verification" principle exemplifies…

Hybrid Search(also: Hybrid sign-language search)

A sign-language dictionary search pattern that combines search-by-video (a user performs the sign into a camera for sign recognition to match) with search-by-feature (manual filtering of the candidate list by linguistic properties such as handshape and location). Introduced as a…

Hybrid Space(also: Blended Space, Hybrid Community Space)

A community or program environment that combines both in-person and online elements, not necessarily simultaneously, to create a more accessible and inclusive experience. In accessibility contexts, hybrid spaces address barriers such as geographic distance, mobility limitations,…

Hybrid automaton(also: Hybrid state machine)

A computational model that combines discrete state transitions with continuous dynamics, used in interactive systems to govern object behaviours based on multiple users's simultaneous inputs. In collaborative virtual environments for autism intervention, hybrid automata control…

Hydrocephalus(also: Hydrocephaly, Water on the Brain)

A condition characterized by an abnormal accumulation of cerebrospinal fluid within the ventricles of the brain, causing increased intracranial pressure and enlargement of the head. Hydrocephalus can be congenital or acquired, and if untreated can lead to developmental delays,…

Hyper-aged Society(also: Super-aged Society)

A country or region where people aged 65 and over make up more than 21% of the total population. The term distinguishes extreme demographic aging from merely "aging" (7%+) or "aged" (14%+) societies. Japan became the world's first hyper-aged society around 2007 and is widely…

Hyperactivity

A core symptom of ADHD characterized by excessive movement, restlessness, difficulty remaining seated or still, and feeling driven as if by a motor. In adults, hyperactivity often manifests as internal restlessness rather than obvious physical activity. For digital…

Hyperacusis(also: Decreased sound tolerance)

A hearing condition in which everyday sounds are perceived as uncomfortably or painfully loud, even at volume levels that are tolerable for most people. Hyperacusis involves a reduced tolerance for the overall volume of sound rather than sensitivity to specific sound types…

Hyperarticulation(also: Clear Speech, Over-Articulation)

A speaking style in which a person exaggerates the clarity of their pronunciation by moving their tongue and mouth to more extreme positions, producing more distinct vowel and consonant sounds. Hyperarticulation occurs naturally when speakers perceive that their listener is…

Hyperfixation

Hyperfixation is an intense, prolonged focus on a single activity, topic or interest to the exclusion of other tasks and bodily needs, commonly associated with ADHD and autism. Unlike hyperfocus, which is often channelled toward a productive task, hyperfixation can latch onto…

Hyperfocus(also: Hyper-Focus, Flow State)

A state of intense, sustained concentration on a task or activity, commonly experienced by people with ADHD and other neurodivergent conditions. During hyperfocus, individuals may become deeply absorbed in work for extended periods, achieving exceptional productivity and depth…

Hypergraph

A mathematical structure that generalises both trees and graphs by allowing edges (called hyperedges) to connect any number of nodes rather than being limited to exactly two. In the context of accessible graphical representations, hypergraphs are used to model the visual…

Hypermedia

An extension of hypertext that incorporates multimedia content — audio, video, images, and animation — alongside text, all linked in a non-linear structure. What distinguishes hypermedia from hypertext is the implied sequencing required for time-based media: a video contains…

Hyperopia(also: Farsightedness, Long-Sightedness, Hypermetropia)

A refractive error in which the eye focuses light behind the retina rather than on it, causing near objects to appear blurred while distant objects may remain relatively clear. Hyperopia occurs when the eyeball is too short or the cornea is insufficiently curved. It is…

Hyperstory(also: Interactive Story, Branching Narrative, Hypertext Story)

A hyperstory is an interactive, non-linear narrative structure in which users make choices that influence the direction and outcome of the story. Adapted from hypertext concepts, hyperstories combine storytelling with interactive exploration, allowing users to navigate through…

Hypertext

A way of organising and presenting textual content in a non-linear manner by breaking it into fragments and describing the relationships between them. A book has chapters in a fixed order, but hypertext allows content to be navigated in multiple paths through links between…

Hypervigilance

A state of heightened alertness and sensitivity to potential threats in one's environment, commonly associated with PTSD, anxiety disorders, and trauma. Hypervigilant individuals may constantly scan for danger, feel uncomfortable with people behind them, need clear exit routes,…

Hypotonia(also: Low Muscle Tone, Muscle Hypotonia, Floppy Muscle Syndrome)

A condition characterized by decreased muscle tone, resulting in reduced resistance to passive movement and often affecting posture and motor control. Hypotonia is common in many developmental disabilities including Down syndrome, cerebral palsy, and various genetic conditions.…

IAAP(also: International Association of Accessibility Professionals)

A professional membership organisation founded in 2014 that defines, promotes, and certifies accessibility professionals worldwide. IAAP offers certification programs including the Certified Professional in Accessibility Core Competencies (CPACC) for foundational knowledge and…

IAccessible2(also: IA2)

An open accessibility API specification originally developed by IBM and donated to the Linux Foundation. IAccessible2 extends Microsoft Active Accessibility (MSAA) to support the richer semantic information needed by Web 2.0 applications, including WAI-ARIA roles, states, and…

IBM Home Page Reader(also: Home Page Reader, HPR)

IBM Home Page Reader (HPR) was a pioneering voice browser developed by IBM that provided audio-based web browsing for people with visual disabilities. Unlike screen readers that operate as an overlay on top of a visual browser, Home Page Reader was a self-contained browser that…

IC2D(also: Integrated Communication 2 Draw)

A drawing application developed at UC Berkeley that enables blind and visually impaired users to create, explore, and label graphical images using a keyboard-operated grid-based auditory interface. IC2D uses a recursive 3x3 grid mapped to the telephone numpad for spatial…

ICADD(also: International Committee on Accessible Document Design)

A non-profit organization that developed techniques for making structured electronic documents accessible to people with print disabilities. ICADD created the SDA (SGML Document Access) mechanism — a set of attributes that map complex document type definitions to a simplified…

ICCHP(also: International Conference on Computers Helping People with Special Needs)

A biennial research conference on technology for people with disabilities, held in Europe since 1989. ICCHP provides a peer-reviewed academic venue for accessibility research with a strong European perspective, complementing the ASSETS conference. Topics span assistive…

ICF(also: International Classification of Functioning, Disability and Health)

A framework developed by the World Health Organization (WHO) and endorsed by all 191 member states in 2001 for describing and measuring health and disability. The ICF takes a biopsychosocial approach, classifying functioning and disability across four components: body functions…

ICT Accessibility(also: Information and Communication Technology Accessibility)

The design and development of information and communication technology products and services so they can be used by people with the widest range of abilities, including those with visual, hearing, motor, and cognitive disabilities. ICT accessibility encompasses hardware,…

ICT4D(also: Information and Communication Technologies for Development, ICTD)

A field of research and practice focused on how information and communication technologies can be designed, deployed, and used to support social and economic development, particularly in low- and middle-income countries. ICT4D examines the unique social, cultural, and…

ICTD(also: Information and Communication Technologies and Development, ICT4D)

A research field and practice area focused on designing, deploying, and evaluating information and communication technologies to improve socio-economic outcomes in low-resource and developing contexts. ICTD research addresses challenges such as limited infrastructure,…

IDE(also: Integrated Development Environment)

A software application that provides a comprehensive environment for writing, testing, and debugging code. Common IDEs include Visual Studio Code, IntelliJ IDEA, and Xcode. In accessibility contexts, IDEs are important because they can host plugins and extensions that help…

IDE Accessibility(also: Accessible IDE, Development Environment Accessibility)

IDE accessibility refers to making integrated development environments — the software applications used for writing, testing, and debugging code — usable by developers with disabilities. IDEs like Visual Studio Code, IntelliJ, and Eclipse present significant accessibility…

IDEA(also: Individuals with Disabilities Education Act)

A United States federal law enacted in 1990 (reauthorized in 2004) that guarantees students with disabilities the right to a free appropriate public education (FAPE) in the least restrictive environment. IDEA requires schools to develop Individualized Education Programs (IEPs)…

IDEIA(also: Individuals with Disabilities Education Improvement Act, IDEA 2004)

The Individuals with Disabilities Education Improvement Act of 2004, which reauthorized and amended the original IDEA legislation. IDEIA strengthened requirements for highly qualified special education teachers, expanded early intervention services, and updated provisions for…

IEP(also: Individualized Education Program, Individualized Education Plan)

A legally mandated written plan in the United States, developed annually by a team including parents, teachers, and specialists, that sets out the specific educational goals, services, accommodations, and assistive technologies required for a student aged 3–21 with a qualifying…

IIIF(also: International Image Interoperability Framework, Triple-I-F)

The International Image Interoperability Framework (IIIF) is a set of open, community-developed technical specifications and APIs that enable cultural heritage institutions to share, access, and reuse digital image collections in a standardised way. IIIF provides an Image API…

IMS AccessForAll(also: AccLIP, IMS Accessibility for LIP, AccessForAll)

A specification from IMS Global Learning Consortium that defines how to describe learner accessibility preferences and match them with appropriate learning resources. IMS AccessForAll extends the IMS Learner Information Package (LIP) with detailed accessibility preference…

IMS Content Packaging(also: IMS CP, Content Package)

IMS Content Packaging is a specification from the IMS Global Learning Consortium that defines a standard way to bundle and exchange digital learning content between different learning management systems and educational platforms. A content package consists of a manifest file…

IMSLP(also: International Music Score Library Project, Petrucci Music Library)

A free online repository of public domain music scores, also known as the Petrucci Music Library. IMSLP hosts hundreds of thousands of scores primarily in PDF format, making it one of the largest collections of freely available music notation. While an invaluable resource for…

ISCII(also: Indian Script Code for Information Interchange)

A character encoding standard developed by the Government of India for representing Indian language text in digital systems. ISCII uses a single encoding scheme that can represent characters from all major Indian scripts by exploiting their common phonetic structure — each…

ISO 24751(also: ISO/IEC 24751, Individualized Adaptability and Accessibility in E-Learning)

ISO 24751 (Individualized Adaptability and Accessibility in E-Learning, Education and Training) is an international standard for matching the accessibility features of digital learning resources and environments to the needs and preferences of individual learners. Published in…

ISO 9241(also: ISO 9241-171, Ergonomics of Human-System Interaction)

An international standard from the International Organization for Standardization covering the ergonomics of human-system interaction. Part 171 (ISO 9241-171:2008) specifically addresses accessibility guidance for software, providing requirements and recommendations for making…

ISO 9241-210(also: Human-Centred Design Standard, Ergonomics of Human-System Interaction — Part 210)

An international standard specifying the principles and activities of human-centred design (HCD) for interactive systems. It defines a six-step iterative process — understanding context of use, specifying user requirements, producing design solutions, and evaluating against…

Iceberg Theory of Stuttering(also: Sheehan's iceberg)

A model proposed by Joseph Sheehan (1970) describing stuttering as an iceberg whose visible behaviours - blocks, repetitions, prolongations - are only a small fraction above the waterline. The much larger hidden portion comprises cognitive and affective reactions: avoidance,…

Icon(also: Icons, UI Icon)

A small graphical symbol used in graphical user interfaces (GUIs) to represent an application, file, function, or object. Icons rely on visual recognition rather than text reading, which can be both an advantage and a barrier for users with visual impairments depending on…