When I work on site structures I often drive the client and even my colleagues mad. You see, I don’t always make my site structures logical. People convince themselves that information architecture is about organising content in a logical way. It is not.
The problem is that people aren’t logical. We pretend to be. But we make decisions based on cultural bias, upbringing, preconceptions and many other factors.
Take for example your local supermarket. When you visit it where do you look for tomatoes? You look in the veg section don’t you.
But why don’t supermarkets put tomatoes with the fruits. After all it is a fruit. That would be the logical thing to do. They don’t do that because people expect to see it with the vegetables, because of their preconceptions.