Work by Usability HCI

In design, usability is the study of the ease with which people can employ a particular tool or other human-made object in order to achieve a particular goal. This can include endeavors as varied as consumer electronics, communication, and knowledge transfer objects (such as a cookbook, a document or online help) and mechanical objects such as a door handles or a hammer.

Usability includes the methods of measuring usability and the study of the principles behind an object's perceived efficiency or elegance.