Think of people trying to find the information they are looking for as bloodhounds on a hunt. They try to pick up the "scent" of the information they are looking for and try to follow that "scent of information" to a successful end - the web page that has the information they want.
If a link gives off "good scent," people feel confident that they are on the way to what they want. As Jared Spool shows in his report on Designing for the Scent of Information, measuring people's confidence at each page on a pathway is a good way to tell if your links are working well for your web users.
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