In principle, the term usability as it relates to the creation of websites refers to how easy it is for users to learn and use a website to achieve the required outcomes and their level of satisfaction with the site processes. User-Centred-Design is a key methodology for creating sites based upon positive and intuitive user experiences. What Does Usability Measure
How does Usability work as a measure of a website’s success?
Usability is THE key measure of the quality of a user’s experience when using a web interface; whether that be a website, a web application or a mobile application/website. Usability, however is not one-dimensional, it combines many factors such as:
Ease of learning – how intuitively can a new visitor understand and use the interface to complete their required tasks?
Efficiency of use – once familiar with the interface, how quickly can the user accomplish what they require?
Memorability – how easy is it for a returning visitor to remember how to use the interface upon returning?
Frequency of errors and severity – how often do users make mistakes, how serious are they and how easy is it for users to recover from them?
Subjective satisfaction – how well does the user actually like using the site/application?