Glossary

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Retinopathy of Prematurity(also: ROP)

An eye condition that can occur in premature infants when abnormal blood vessels grow in the retina. In severe cases, these vessels can cause scarring, retinal detachment, and significant vision loss or blindness. ROP is one of the leading causes of childhood blindness and low…

Retrieval-Augmented Generation(also: RAG)

An AI technique that enhances the responses of large language models (LLMs) by first retrieving relevant information from an external knowledge base or document collection, then providing that information as context for the model to generate its response. In accessibility…

Retrofit Accessibility(also: Accessibility Retrofitting, Bolt-On Accessibility)

The practice of adding accessibility features to a product, system, or interface after it has already been designed and built for non-disabled users. Retrofit accessibility often results in suboptimal experiences because the fundamental interaction paradigms may be misaligned…

Retrospective Protocol(also: Retrospective Think Aloud, Retrospective Verbal Protocol, Post-Task Protocol)

A usability evaluation method in which participants complete tasks first and then describe their thought processes, decisions, and experiences immediately afterwards, rather than verbalising concurrently during the task. Retrospective protocols are particularly important in…

Rett Syndrome(also: RTT)

A rare, X-linked neurodevelopmental disorder caused in most cases by mutations in the MECP2 gene, affecting almost exclusively females. After typical early development, children with Rett syndrome lose purposeful hand use and acquired speech between 6-18 months, develop…

Revenge Bedtime Procrastination(also: Revenge Procrastination)

The deliberate delay of sleep without external factors forcing the delay, in order to reclaim personal time lost during a busy or low-autonomy day. The "revenge" framing points to reclaiming agency over one’s own time. The behavior is particularly common among people with ADHD,…

Reverse Dictionary(also: Sign-to-English Dictionary, ASL-to-English Dictionary)

A dictionary tool that allows users to search for the meaning of a sign language sign by inputting its visual or linguistic properties — such as handshape, location, movement, and orientation — rather than searching from a known English word. Reverse dictionaries address the…

Reverse Inclusion

A design approach that begins with the lived experience and needs of a person with a disability and then expands the design outward to include broader social circles and communities. Reverse inclusion inverts the typical inclusive design process, which starts from neurotypical…

Reverse Privacy Paradox

The reverse privacy paradox is a pattern, described by Zhang and colleagues in research on LLM-based conversational agents, in which users appear to disregard privacy concerns in the moment of use while still recognising those concerns exist and being willing to adopt…

Revocable Consent(also: Withdrawable Consent)

A consent pattern in which the user can withdraw their previously granted permission at any time, typically through a persistent, discoverable UI control that immediately halts data processing and triggers deletion of data collected under that consent. A stronger form than…

Rhetorical Question (ASL)(also: ASL Rhetorical Question, RHQ)

In American Sign Language, a grammatical construction in which the signer poses a question and then immediately answers it, used as a cohesive rhetorical device rather than as a genuine inquiry. ASL rhetorical questions are marked by specific non-manual signals — typically…

Rheumatoid Arthritis(also: RA)

A chronic autoimmune disorder that causes inflammation, pain, stiffness, and swelling in the joints, particularly in the hands, wrists, and fingers. Rheumatoid arthritis can significantly affect a person's ability to use computers by reducing grip strength, limiting finger…

Rhythm Game(also: Music Game, Music/Rhythm Game)

A genre of video game in which players must perform actions — such as pressing buttons, tapping a screen, or moving a controller — in time with music or a rhythmic pattern. Popular examples include Guitar Hero, Rock Band, Dance Dance Revolution, and Beat Saber. Rhythm games are…

Rhythm-Action Game(also: Rhythm Game, Music Rhythm Game, Beat-Matching Game)

A genre of video game in which players must make timed inputs (button presses, key strokes, or physical movements) synchronised with musical beats or rhythmic patterns. Popular examples include Dance Dance Revolution, Guitar Hero, and PaRappa the Rapper. Rhythm-action games are…

Rich Internet Application(also: RIA, Dynamic Web Application)

A web application that uses JavaScript and related technologies to provide interactive features, dynamic content updates, and sophisticated user interface widgets that approach the functionality of desktop applications. RIAs present significant accessibility challenges because…

Rich Text(also: Formatted Text, Styled Text)

Text content that includes visual formatting attributes beyond plain characters, such as font size, font family, color, bold, italic, underline, and other styling properties. On the web, rich text is created through HTML elements and CSS properties that give text visual emphasis…

Rich internet application(also: RIA)

A web application that uses client-side scripting (typically JavaScript) to provide dynamic, interactive functionality similar to desktop software, including features like drag-and-drop, real-time updates, and complex widgets. Rich internet applications present significant…

Right to Education(also: RTE, Right to Education Act)

Legal frameworks guaranteeing the right to free and compulsory education for all children, including children with disabilities. India's Right to Education Act (2009) mandates free education for all children aged 6-14 and includes a controversial "no detention" policy requiring…

Right to Erasure(also: Right to be Forgotten, GDPR Article 17)

A user right under the EU General Data Protection Regulation (Article 17) to have their personal data deleted by a data controller when certain conditions are met (e.g., data no longer needed, consent withdrawn, unlawful processing). Implemented in accessible products through…

Right to Repair

A movement advocating for consumers' ability to repair, modify, and maintain their own devices and equipment, including access to diagnostic information, repair manuals, and replacement parts. For people with disabilities, right to repair is especially significant because…

Right-of-Way(also: Pedestrian Right-of-Way, ROW)

Right-of-way refers to the legal right of a pedestrian, vehicle, or other entity to proceed with precedence over others in a specific area of public space. In accessibility, pedestrian right-of-way is critical because sidewalks, curb ramps, and crosswalks are essential pathways…

Rigid Scoping

A voice navigation strategy that requires users to explicitly navigate through a hierarchical structure before issuing commands to specific targets. In rigid scoping, the user must first select a container or menu level, then name items within that scope, preventing ambiguity by…

Rigidity(also: Muscle Rigidity, Stiffness)

Increased muscle tone causing stiffness and resistance to passive movement, commonly experienced in Parkinson's Disease and other neurological conditions. Unlike spasticity (which varies with movement speed), rigidity is constant throughout the range of motion. Rigidity affects…

Risk-Free Exploration(also: Safe Exploration)

Risk-free exploration is a design principle for making touchscreen interfaces accessible to blind users by enabling them to explore the screen surface without accidentally triggering interface actions. On standard capacitive touchscreens, any finger contact can activate buttons,…

Robo-Identity(also: Robot Identity, Robot Persona)

An emerging concept in human-robot interaction research referring to the identity or persona a robot takes on, as perceived and co-constructed by the people it interacts with. Robo-identity is not a fixed property of the robot itself but is negotiated dynamically through…

Robodebt(also: Online Compliance Intervention)

An automated debt-recovery scheme run by Services Australia (Centrelink) from 2016 to 2020, which used income-averaging algorithms to calculate alleged welfare overpayments and issue hundreds of thousands of debt notices without human review. A Royal Commission in 2023 found the…

Robot-Assisted Feeding(also: Assistive Feeding Robot, Robotic Feeding System, RAF)

A robotic system designed to help people with upper-limb motor impairments eat independently by automating the process of acquiring food from a plate and transferring it to the user's mouth. Robot-assisted feeding systems range from simple table-mounted devices with spoons (like…

Robotic Arm(also: Robot Arm, Assistive Robotic Arm, Manipulator Arm)

A programmable mechanical device with jointed segments that can grasp, move, and manipulate objects, controlled through various input methods. In assistive technology contexts, robotic arms are used to extend the physical capabilities of people with motor impairments, enabling…

Robotic Guide Dog(also: Robot Guide Dog, Quadruped Guide Robot)

A mobile robot — typically a quadruped platform — designed to provide navigation and obstacle-avoidance support for blind and low-vision users, filling a role analogous to that of a trained guide dog. Research prototypes have explored handler interaction, leash-based coupling,…

Robotic Social Attributes Scale(also: RoSAS, RoSAS-SF, Robotic Social Attributes Scale Short Form)

A validated psychometric instrument developed by Carpinella et al. (2017) that measures how people perceive the social attributes of a robot along three subscales: Warmth (how likable, friendly, and companionable the robot feels), Competence (how capable, knowledgeable, and…

Role Attribute(also: ARIA Role, WAI Role)

An HTML attribute that defines the purpose or type of a user interface element, communicating its function to assistive technologies. Originally proposed as part of the XHTML namespace-based approach described by Gibson and Schwerdtfeger at IBM, the role attribute became a…

Role Shifting(also: Referential Shift, Constructed Action)

A narrative device in American Sign Language (and many other sign languages) in which a signer takes on the persona, gaze, and body posture of a character in a story, dropping the default "narrator" framing. Role shifting is marked by a subtle shift in the signer's body, head…

Role Switching(also: Role Rotation, Role Alternation)

An educational strategy where learners alternate between different roles or responsibilities within a collaborative activity. In collaborative sign language learning, role switching allows players to alternate between controlling manual signs and non-manual signs, ensuring both…

Role-Based Access Control(also: RBAC)

An authorisation model in which system permissions are attached to roles (e.g., user, administrator, clinician, caregiver) and users are granted one or more roles rather than permissions directly. Widely used in healthcare, enterprise software, and increasingly in…

Role-play(also: Role-playing, Roleplay)

A social behaviour in which a person treats a non-human or virtual agent as if it had a character, feelings, or agency — narrating its actions, giving it a name, addressing it in character, and rationalising its mistakes with in-character explanations. In accessibility research…

Roll-up Captions(also: Roll-up style, Scroll-up Captions)

A captioning display style in which text is added one word or line at a time, scrolling upward as new text arrives and pushing earlier lines off the top. Roll-up is typically used in live captioning because it can display words as they are produced without waiting for a full…

Rollator(also: Wheeled Walker, Rolling Walker)

A walking frame equipped with wheels, handbrakes, and typically a built-in seat, designed to provide stability and support for people with mobility difficulties. Unlike standard walkers that must be lifted with each step, rollators roll forward continuously, reducing the…

Route Description(also: Verbal Route Description, Navigation Instructions)

A verbal or written account of how to travel from one location to another, including directions, landmarks, warnings, and environmental features. Research with blind and partially sighted travelers has shown that effective route descriptions include information about turns and…

Route Knowledge(also: Procedural Knowledge, Sequential Knowledge)

Route knowledge is a type of spatial understanding that consists of sequential, turn-by-turn information about how to get from one place to another along a specific path. In navigation for people with disabilities, route knowledge is what most GPS apps provide — step-by-step…

Route Learning(also: Route Familiarization)

The process by which a traveler — particularly a blind or low-vision person — acquires a mental representation of a specific path through an environment, including its turns, landmarks, distances, surface changes, and points of interest. Route learning is a core component of…

Route Planning(also: Journey Planning, Pre-Journey Planning)

The process of determining a path from an origin to a destination before travel begins, including selecting roads or paths, identifying landmarks and decision points, and considering factors such as safety, accessibility, and personal preferences. For blind and visually impaired…

Routine Infrastructuring

A concept developed by Bryan Semaan describing community practices through which marginalised and oppressed groups continually reconfigure sociotechnical arrangements to sustain everyday life under persistent disruption. Unlike classical infrastructuring, which treats disruption…

Routinisation(also: Routinization, Age-Related Routinisation)

The tendency of older adults to increasingly organise their daily activities into fixed, predictable routines as they age. As cognitive resources decline, older adults optimise their remaining capacity by performing activities in the same order, at the same times, and in the…

Row-Column Scanning(also: RCS, Grid Scanning, Two-Switch Scanning)

The most widely used single-switch selection method for augmentative and alternative communication (AAC) devices and on-screen keyboards. Options are arranged in a two-dimensional grid, and the interface sequentially highlights each row. When the user clicks their switch, the…

Rubber Banding(also: Rubber-Band AI, Catch-Up Mechanic)

A handicapping technique, common in racing games, that dynamically adjusts the speed or performance of leading and trailing players to keep them close together. Traditional rubber banding operates by boosting the trailing player or hampering the leader in ways that are not…

Ruby Annotation(also: Ruby Text, Furigana, Ruby Markup)

Small glossing text placed above, beside, or below a base character to indicate pronunciation or meaning — most commonly used for Japanese furigana (kana reading hints above kanji), but also applied in Chinese bopomofo/pinyin, Korean hangul aids, and multilingual teaching…

Rumination(also: Mental Compulsion, Obsessive Rumination)

A repetitive, often circular pattern of thinking in which a person dwells on distressing thoughts, questions, or scenarios without reaching resolution. In OCD, rumination is a covert mental compulsion where individuals repeatedly analyze obsessive thoughts, seek mental…

Running Stitch(also: Back Stitch, Stem Stitch)

A basic embroidery stitch that creates a dashed or continuous line by passing the needle in and out of the fabric at regular intervals. Running stitch and its variants (back stitch, stem stitch) are fundamental line-making stitches used in embroidery. In tactile graphics,…

Runtime Accessibility(also: dynamic accessibility, on-demand accessibility adaptation)

Runtime accessibility refers to the ability to modify, adapt, or enhance the accessibility of a software application or digital environment while it is actively running, rather than through static design-time configurations or developer-authored presets. Traditional…

SAE Automation Levels(also: SAE J3016, Levels of Driving Automation)

A six-level classification system (0-5) defined by SAE International that describes the degree of vehicle automation. Level 0 provides no automation; Levels 1-2 offer driver assistance features; Level 3 provides conditional automation where the vehicle can drive but a human must…