Definitions for "Usability testing"
Originally, this referred to methods that measured the usability of electrical equipment. These days, most usability testing is of web sites, but it's also possible to test written instructions using the same methods.
The eighth phase in the Delta method where the prototype is tested and evaluated by users and usability expertise.
the system testing of an integrated, blackbox application against its usability requirements to determine if it contains any usability defects.