This chapter discusses user interfaces for communication between human information seekers and information retrieval systems. Information seeking is an imprecise process. When users approach an information access system they often have only a fuzzy understanding of how they can achieve their goals. Thus the user interface should aid in the understanding and expression of information needs. It should also help users formulate their queries, select among available information sources, understand search results, and keep track of the progress of their search.
This document (a simple ASCII file) contains answers to some more or less frequently asked questions from theoretical physics. Currently, the FAQ contains 148 topics, grouped into 20 chapters, and filling over 10000 lines of text (about half a megabyte), corresponding to a book of about 200 pages.