From Wikipedia:

Usability is the ease of use and learnability of a human-made object. The object of use can be a software application, website, book, tool, machine, process, or anything a human interacts with. A usability study may be conducted as a primary job function by a usability analyst or as a secondary job function by designers, technical writers, marketing personnel, and others. It is widely used in consumer electronics, communication, and knowledge transfer objects (such as a cookbook, a document or online help) and mechanical objects such as a door handle or a hammer. Usability includes methods of measuring usability and the study of the principles behind an object's perceived efficiency or elegance. In human-computer interaction and computer science, usability studies the elegance and clarity with which the interaction with a computer program or a web site (web usability) is designed.

A rather broad and ambiguous category.

Articles in this category are likely to be related to:

  • Research Methods and Techniques</li>
  • Heuristics</li>
  • User Acceptance Testing</li>
  • Remote Research</li>
  • Direct Observation Research</li>
  • User Reported Feedback</li>
  • Analytics and Tracking</li>