Six Styles for Usability Requirements.
Søren Lauesen, Houman Younessi · 1998
Abstract. A system can have adequate functionality, but inadequate usability because it is too difficult to use. The purpose of usability requirements is to guard against that. This paper shows six styles for usability requirements seen in practice or recommended by experts. For each style we discuss how we can verify the requirements, how we can use them during development, how we elicit the data for the specification, and to what extent the style covers the essence of usability.