Explores nature and magnitude of extensions needed in order to use a library circulation control system as an online catalog, noting Margaret Mann's eight functions of a library catalog, authority control, cross references, correlating subjects, structure revision, adding access, terminal needs, and system reliability. Nine references are cited.…

Arguing that inadequacy of subject access in online catalogs lies with the database used as a foundation, this essay discusses the weaknesses of Library of Congress subject cataloging and MARC records, electronic card catalogs, enhancement of data, publisher warnings, Boolean search strategy inadequacies, and changes in the national standard. (EJS)

Comparison of access through the traditional catalog and online systems focuses on functions of the library card catalog--to provide access to all of author's work including works whereby author is identified in nonidentical ways, and to present to user all editions and translations as representations of a given work. (EJS)