Glossary

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UI Agent(also: User Interface Agent, Browser Agent, AI Agent)

An AI-powered software system that can autonomously interact with graphical user interfaces on behalf of a user, performing tasks by interpreting natural language commands and translating them into interface actions such as clicking buttons, entering text, and navigating between…

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…

User Enactment(also: UE, Experience Prototyping)

A research method in which participants explore emerging or future technologies through simulated scenarios using physical enactment stages (mockup environments). User enactment combines brainstorming, where participants speak aloud their thoughts and decisions, with…

User Frustration(also: Computer Frustration, Technology Frustration)

The emotional response experienced by users when technology fails to meet their expectations or prevents them from completing tasks. User frustration can be caused by errors, confusing interfaces, inaccessible content, slow response times, or situations where the computer is…

User Interface Agent(also: Interface Agent, Software Agent, Assistant Agent)

A software component that observes user behaviour and the state of an application, then unobtrusively offers help — suggestions, shortcuts, summaries, or warnings — to reduce workload or prevent errors. In accessibility research, interface agents have been used to monitor a…

User Modelling(also: User Modeling, User Profiling)

The process of creating and maintaining a digital representation of a user's characteristics, preferences, needs, and behaviours to personalise their interaction with a system. In accessibility contexts, user modelling captures information about a person's disabilities,…

User model(also: User modeling, User modelling)

A computational representation of a user's characteristics, abilities, preferences, and behavior patterns, used to predict how they will interact with a system or to adapt an interface to their needs. In accessibility contexts, user models capture attributes such as motor range…

User-System Model(also: User-System Interaction Model)

A conceptual model that describes the relationship between a user and the technology system they interact with, taking into account the user's abilities, preferences, and needs alongside the system's capabilities, interfaces, and constraints. In accessibility engineering,…

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