Krug, Steve. Don't Make Me Think! A Common Sense Approach to Web Usability. 2nd ed. New Riders, 2006.
Observed-task testing and its limits; full-source review with PDF sheet locators.
Steve Krug, Don't Make Me Think! A Common Sense Approach to Web Usability, 2nd ed. (New Riders, 2006), supplied PDF sheets 157–195; imaginary annotated session, sheets 181–191.
Krug, Steve. Don't Make Me Think! A Common Sense Approach to Web Usability. 2nd ed. New Riders, 2006. ISBN 0-321-34475-8. Supplied reflowed PDF, 252 sheets.
PDF sheet 195
PDF sheet 157
Krug, Don't Make Me Think!, PDF sheets 157–195.
Usability testing
Edition/copyright/ISBN checked in supplied copy. Sheet locators differ from printed pagination; imaginary session is instructional example, not empirical study.