The information architect is concerned with cataloging, signage, and search, with making sure that each item in the inventory is stored in the proper place, and that it is described in the proper way. The book's strongest chapter, on Labeling Systems, is almost pure library science. Haphazard categories, they argue, are inefficient and distracting. Labels should reflect the readers' needs, not the company organization chart. Though the authors' background as librarians is their strength, it also weakens the book.
Navigation is regarded to search engines and indexes.
It is odd that Rosenfeld and Morville seize the title of architect, because the central claim of the architect's profession is the very breadth of concern that Information Architecture lacks. Beyond the supervisory power of the job title, Rosenfeld and Morville aren't very interested in architecture. Because their architects generally don't live or work in the buildings they design. That hardly seems fair. Even the casual observer of architecture will see the flaws here.