Usability Framework (Shackel)

Human factors for informatics usability By Brian Shackel, Simon J. Richardson Chapter 2 Usability - Context, Framework, Definition, Design and Evaluation Brian Shackel http://books.google.com.my/books?hl=en&lr=&id=KSHrPgLlMJIC&oi=fnd&pg=PA21&dq=usability+framework&ots=ITWmRUSVB9&sig=5q50cAypuH-8I1LN4KPWtRRIoEs#v=onepage&q=usability%20framework&f=false