Web usability

I wikipedia:

Web usability is the application of usability in those domains where web browsing can be considered as a general paradigm (or "metaphor") for constructing a GUI.

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Usability testing

I Wikipedia:

Usability testing is a means for measuring how well people can use some human-made object (such as a web page, a computer interface, a document, or a device) for its intended purpose, i.e. usability testing measures the usability of the object. Usability testing focuses on a particular object or a small set of objects, whereas general human-computer interaction studies attempt to formulate universal principles.

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Usability

I Wikipedia:

Usability is a term used to denote the ease with which people can employ a particular tool or other human-made object in order to achieve a particular goal. Usability can also refer to the methods of measuring usability and the study of the principles behind an object's perceived efficiency or elegance.

se mere på http://en.wikipedia.org/wiki/Usability