Part III 
Types of Information Retrieval Systems
In this section, we proceed to review many different types of information retrieval systems, with an emphasis on Web-based systems. Though some common internal mechanisms are used within IR systems, such systems also have to be adapted to the hugely varying circumstances of their use. One size does not fit all, and great improvements in performance can be attained through design for specific uses and audiences.
Randolph Hock, of Online Strategies, introduces “Search Engines” (Chapter 22), the key type of IR system used on the World Wide Web. Carlos Castillo and Ricardo Baeza-Yates, of Yahoo! Research, ...
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