1. Jakob Nielsen uses increasing corporate budget allocations for usability engineering as well as “the increasing number of personal computer trade press magazines that include usability measures in their reviews,” as evidence of this increase. See Jakob Nielsen, “Usability Laboratories: A 1994 Survey,” Useit.com: Usable Information Technology, (n.d.) available online: http://www.useit.com/papers/uselabs.html (accessed January 6, 2000).
2. ISO DIS 9241-11, Ergonomic Requirements for Office Work with Visual Display Terminals. Part 11: Guidance on Usability (London: International Standards Organization, 1994), p. 10.
3. Jakob Nielsen, Usability Engineering (Boston: Academic Press, 1993). Other useful books and Web resources on HCI and usability engineering in general include: Keith Instone, Usable Web, available online at http://usableWeb.com/(accessedJuly15,2000);
4. Ben Shneiderman, Designing the User Interface: Strategies for Effective Human-Computer Interaction, 3rd ed. (Reading, MA: Addison Wesley Longman, 1998); Bryce L. Allen, Information Task: Toward a User-Centered Approach to Information Systems (San Diego, CA: Academic Press, 1996).
5. Jeffrey Rubin, The Handbook of Usability Testing: How to Plan, Design, and Conduct Effective Tests (New York: Wiley, 1994); Joseph C. Dumas & Janice C. Redish, A Practical Guide to Usability Testing (Norwood, NJ: Ablex Publishing Co., 1993). Since our testing, a 1999 edition of this title has been published by Intellect, Exeter.