Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Universal Usability
- An approach to technology design that aims to make systems usable by the widest possible range of people, including children, older adults, people with various impairments, people engaged in other tasks, and users with differing levels of education, literacy, and socio-economic…
- Usability(also: 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, as defined by ISO 9241-11. It goes beyond mere accessibility compliance to…
- 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, but the experience of completing it is unsatisfactory. For example, a web page…
- 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, conducting user analysis, iterative prototyping, and empirical testing with…
- Usability Heuristics(also: 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 real world, user control and freedom, consistency and standards, error…
- Usable Accessibility
- Usable accessibility is the principle that meeting technical accessibility standards (such as WCAG compliance) is necessary but not sufficient for ensuring that people with disabilities can effectively use digital products. A website may be technically accessible — screen…
- User Engagement Scale(also: UES, UES-SF)
- A validated self-report questionnaire for measuring user engagement with digital systems across dimensions including focused attention, perceived usability, aesthetic appeal, and reward. Developed by O'Brien and Toms and later shortened to the 12-item UES Short Form (UES-SF),…
- User Experience(also: UX)
- A person's perceptions and responses resulting from the use or anticipated use of a product, system, or service, encompassing emotions, beliefs, preferences, physical and psychological responses, and behaviours. Defined by ISO 9241-210, user experience goes beyond usability…
- User Experience Questionnaire(also: UEQ, UEQ-S, Short UEQ)
- A standardised self-report instrument, developed by Schrepp and colleagues, that captures a user's subjective impression of a product across dimensions such as attractiveness, efficiency, perspicuity, dependability, stimulation, and novelty via pairs of contrasting adjectives…
- User Research(also: UX Research, Usability Research)
- The systematic study of users and their needs, behaviours, and experiences to inform the design and development of products and services. User research methods include interviews, surveys, focus groups, usability testing, diary studies, contextual inquiry, and beta testing. In…
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