A simple, understandable navigation scheme is a critical aspect of site design and has a direct effect on the bottom line. http://wdvl.com/Location/Navigation/101/
This article is extracted and adapted from Designing the User Interface: Strategies for Effective Human-Computer Interaction 3rd edn., Reading, MA: Addison Wesley (forthcoming). Longman Publishers, Copyright 1998. http://ijhcs.open.ac.uk/shneiderman/
"The number one activity on the Web is information retrieval." In part of his tutorial, Spool explained his findings on graphic design and users' success. http://www.ddj.com/documents/s=2894/nam1012433861/