Information architecture

What is the information Architecture?
Few days before I surfer on the internet read a article found a new thing the “Information Architecture”
Actually the information architecture is a new title to the interface design now.
In abroad this title has become very popular, why use this title to be describing the interface design?
The interface design as we know not only does the beautiful graphic design work, but the person who has the psychology, and software engineering knowledge, he is the multi skilled, and the comprehensive knowledge person.
Interface design in the psychology, the interface design can be dividing into two layers of felling (sense of vision, touch, sense of hearing...etc.) and emotion.
The user interface design is the importance part of the visual product.
It is a complicated design job; it has lot of different knowledge participate.
The three greatest principles of the user interface design are: interface must under the user control; reduce the memory burden of the user, Keep the consistency of the interface design.

The interface design in the work flow can divide into 3 parts, so call structure design; conceptual design; interactive design.
So just the graphic design knowledge not enough for interface design in IT. Like a architecture not just know how to draw the nice building on the paper, he also have to know the material knowledge etc...
This is not easy to understand thing. But having bit basic knowledge about this will good for us.
What is the soul of interface design? To me, is simply and comfortable, you have to make user comfortable in visual and in use, the Interface you designed must clear and easy to make people know where can find what they want, clear understand what it is.