Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 306 of 333
- Universal design (UD, Design for all, Inclusive design)
- A design philosophy that aims to create products, environments, and systems that are usable by the widest possible range of people without the need for adaptation or specialised design. Coined by arch…
- Universal design for learning (UDL)
- An educational framework based on research in the learning sciences that guides the development of flexible learning experiences to accommodate individual learning differences. UDL provides multiple m…
- Universe of One (Universe-of-One, Personalized Prompting)
- A design approach in assistive technology where content, prompts, and guidance are tailored to each individual user rather than providing generic or standardized instructions. The concept is particula…
- Unmasking (Autistic Unmasking)
- The process of reducing or stopping the suppression of autistic behaviors and traits that occurs during masking. Unmasking involves allowing oneself to express authentic autistic characteristics—such …
- Unobtrusive Interaction (Unobtrusive Interfaces)
- A design orientation, associated with ambient, wearable, and assistive-technology research, that aims to minimise disruption to users' natural behaviour, attention, and social presence. Rather than de…
- Unstable Systems of Access
- Access ecosystems characterized by unpredictability, where resources and stakeholder relationships may shift without warning, forcing reactive decision-making and increasing risk. In unstable systems,…
- Upper Baseline (Gold Standard, Reference Standard)
- In accessibility evaluation research, an upper baseline is a high-quality reference stimulus used to establish the best achievable performance against which other systems are compared. For sign langua…
- Upper Body Motor Impairment (Upper Limb Impairment, Upper Extremity Disability)
- A condition affecting the motor function of the arms, hands, or upper body that limits or prevents the use of standard input devices such as keyboards, mice, and touchscreens. Upper body motor impairm…
- Upper Limb Impairment (Upper Extremity Impairment, Upper Body Impairment)
- Reduced function in one or both arms, hands, or fingers due to conditions such as amputation, paralysis, muscular disorders, spasticity, or joint conditions. In VR and technology accessibility, upper …
- Upper Limb Motor Impairment (Upper Extremity Motor Disability, Hand and Arm Motor Impairment)
- A condition affecting movement, strength, coordination, or fine motor control in the hands, wrists, arms, or shoulders that impacts a person's ability to use standard computer input devices. Causes in…
- Upper Ontology (Foundation Ontology, Top-level Ontology)
- An upper ontology is a high-level, domain-independent ontology that describes very general concepts — such as 'object', 'role', 'event', 'time', or, in a web-accessibility context, generic structural …
- Upper-Body Motor Impairment (Upper Extremity Impairment, Upper Limb Impairment)
- Motor impairments affecting the upper extremities — including the arms, hands, fingers, shoulders, and neck — that limit a person's ability to perform tasks requiring fine motor control, gross motor m…
- Upper-Limb Amputation (Upper Limb Amputation, Arm Amputation)
- The surgical or traumatic removal of all or part of an arm — including transhumeral (above elbow), transradial (below elbow), wrist disarticulation, and partial-hand levels. People with upper-limb amp…
- Upper-Limb Impairment (Upper Extremity Impairment, Arm Impairment, Hand Impairment)
- A physical disability affecting the arms, hands, or fingers that limits a person's ability to perform fine motor tasks such as typing, using a mouse, or operating touchscreen devices. Upper-limb impai…
- Upper-Limb Prosthetic (Upper Limb Prosthesis, Arm Prosthetic, Hand Prosthetic)
- A prosthetic device that replaces or augments part or all of a missing upper limb — fingers, hand, wrist, forearm, or full arm. Upper-limb prosthetics range from passive cosmetic devices and body-powe…
- Urban Accessibility (City Accessibility, Built Environment Accessibility)
- The degree to which urban environments, including streets, buildings, public spaces, and transportation systems, can be navigated and used by people with disabilities. Urban accessibility encompasses …
- Usability (Ease of Use)
- Usability is the extent to which a product, system, or service can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use,…
- Usability Barrier
- A type of access barrier where a task can technically be completed but not with the desired qualities such as speed, ease, accuracy, or comfort. Unlike failure point barriers, the task is possible, bu…
- Usability Engineering
- A systematic, structured approach to designing and evaluating user interfaces that applies engineering principles to usability. Usability engineering involves defining measurable usability goals, cond…
- Usability Heuristics (Nielsen's Heuristics, Nielsen Heuristics, 10 Usability Heuristics)
- A set of ten general principles for user interface design developed by Jakob Nielsen (originally with Rolf Molich in 1990, refined in 1994): visibility of system status, match between system and the r…