ACM: Ubiquity - Need "Therapy" for Your "Information Pain"? LOUIS ROSENFELD: Information architecture the thing is the structure of an information system and the ways it's organized and labeled. Every information system, be it book or Web site, has an architecture. For a book, it's the stuff we all know and count on-chapter and section headings, tables of contents, back of the book indices, sequential pagination, consistent information on the cover and spine, and so on. But for a Web site, your guess is as good as mine-the architecture might consist of many different kinds of hierarchies for navigating, sets of terms used for labeling content, search interfaces, site maps, indices, data models . . . . Unlike books, sites have no conventional information architecture, but that's another story.