Interdependance of structure, information, and presentation
Peter J. Bogaards explains The Document Triangle: The interdependence of the structure, information and presentation dimensions. This troika is very important clear information consumption, but also information reuse. Structure is extremely important to transmitting information, but also important to information reuse. Information lacking structure nearly as reusable as a newspaper article printed on paper.
One great location to explore the ease of information reuse and the affect the presentation layer has should look no farther than, CSS Zen Garden, where nearly all the content is identical in the various layouts and designs. The structure of the content provides a solid framework to rework the presentation layer. The presentation layer can add to or detract from the clarity of the message as well as the attraction a user may have to the message.