Knowra Usability Usability Usability is the extent to which specified users can achieve specified goals effectively, efficiently, and satisfactorily in a specified context of use.
Effectiveness : The accuracy and completeness with which people achieve specified goals. It captures whether users can complete the intended task correctly.
Usability testing : A method that evaluates an interface by observing representative users attempting relevant tasks. Task observations reveal where users struggle and whether they reach their goals.
User-centered design : An iterative design approach that grounds decisions in users, tasks, and their context of use. It makes user goals and usability evidence central throughout product development.
User experience : A person's perceptions and responses resulting from the use or anticipated use of a product, system, or service. It includes broader experiences, while usability focuses on goal achievement in context.
Efficiency : The resources expended in relation to the accuracy and completeness with which people achieve goals. It measures the time and effort required to achieve usable results.
Heuristic evaluation : An expert inspection method that identifies interface problems using established usability principles. It can surface likely usability failures before or alongside user testing.
Interaction design : The design of how people interact with digital products, systems, and services. Usability is a central quality sought in designed interactions.
Utility : The extent to which a system provides the functions users need. A system can be usable yet fail users if it lacks useful functions.
User satisfaction : A person's subjective response to using a product, system, or service. It represents the experiential part of usability, beyond task completion.
System Usability Scale : A ten-item questionnaire that produces a standardized score for perceived system usability. It provides a compact measure of users' overall perceived usability.
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