Does the site speed visitors to their local destinations. Depending on the web designer's choices, site navigation can make information hard to find, or like a good book, compel the user to surf through the entire site. Site designers can control these issues, but only if they are aware of them from the outset of the design process.
Navigation has many dimensions in web design.
In a remarkable MIT site using a Java applet, not HTML, the linkage theme is very clear and intuitive. This is a way to link documents and keywords without having to load new pages all the time. The site shows the promise of creating an entire page of hotspots which do not have to be clicked to generate other imbedded links. If you use the same color on links as visited links, visitors will have no visual clue they have clicked on the link previously.