The Web provides three basic modes of navigation: search, browse, and surf. Few web sites, and still fewer doc sets do all three well.
The something extra? “Pick three and add something extra” comes from Peter Sheahan’s book Flip, in which he flips the traditional business motto “good, fast, cheap: pick two” into what he regards as the new price of admission for business: “good, fast, cheap: pick three and add something extra.”
With findability being the new price of admission of content, I’d suggest that search, browse, surf: pick three and add something extra is the new standard we have to meet.