Lecture 1

Human-Computer Interaction (HCI)

An interdisciplinary field focused on design and evaluation of interfaces to improve interactions between computers and users.

User-Centered Design (UCD)

A systematic, model-driven approach to visual and interaction design that emphasizes usability and user experience.

Usability

The extent to which a product can be used by specified users to achieve specific goals with effectiveness, efficiency, and satisfaction.

Effectiveness (in Usability)

The degree to which software facilitates task completion accurately and with few errors.

Efficiency (in Usability)

The performance of the software in terms of user effort and time to complete a task.

Satisfaction (in Usability)

The degree to which users find the software likable, comfortable, and trustworthy.

Comprehensibility (in Usability)

The clarity and ease of learning associated with the software, including appropriate help and documentation.

ISO 9241-11

An international standard that defines usability in terms of effectiveness, efficiency, and satisfaction in a context of use.

ISO/IEC 9126-1

Defines usability as the capability of a software product to be understood, learned, and used by the user under specified conditions.

UX (User Experience)

All aspects of the user's experience when interacting with a product, service, environment, or facility.

UI (User Interface)

The point of interaction between the user and a digital product, service, or system.

Iterative Prototyping

The process of refining designs based on user feedback and testing, common in User-Centered Design.

Interaction Model

An abstract model that represents human behavior and communication with a computer for task performance.

Usability Evaluation

The process of testing, inspection, and inquiry to identify usability problems and gather user feedback.

Heuristics

Rules of thumb or criteria used by evaluators to identify potential usability issues in a system.