. Amazon.com and Barnes and Noble have completely moved away from this centuryold structure to provide easy access to book information. In the Web environment, the concept of main entry loses its meaning to multiple-access points and linking capabilities of author, subject, and call number. Another prominent drawback of Web-based OPACs is that they have not taken advantage of thesaurus structure and utilized the thesaurus for searching feedback. The hierarchical relationship in LCSH is underutilized in terms of the relationship between terms and associations through related terms. Web-based OPACs have failed to make use of this important access.