Page is a not externally linkable
skibum - 4:00 am on May 29, 2002 (gmt 0)
On the net, the search enigne is the fourth circle that comes into the picture. In a perfect world, these four align and everyone finds your site every time. Since it is never perfect, the job of the SEO is to get as much overlap as possible.
I think fundamentally there are 4 circles that need to overlap. Information Architecture includes the user (searcher), business goals, and content. If a website existed in isolation, these three would be fine.