Usability
http://en.wikipedia.org/wiki/Usability
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.
In human-computer interaction and computer science, usability usually refers to the elegance and clarity with which the interaction with a computer program or a web site is designed. The term is also used often in the context of products like consumer electronics, or in the areas of communication, and knowledge transfer objects (such as a cookbook, a document or online help). It can also refer to the efficient design of mechanical objects such as a door handle or a hammer.
Jakob Nielsen
http://en.wikipedia.org/wiki/Jakob_Nielsen_(usability_consultant)
Jakob Nielsen (born 1957 in Copenhagen, Denmark) is a leading web usability consultant. He holds a Ph.D. in human-computer interaction from the Technical University of Denmark in Copenhagen.
International Organization for Standardization (ISO)/International Electrotechnical Commission (IEC), ISO/IEC 9241
http://www.standardsinfo.net
