Details the characteristics of authority records in the machine readable Library of Congress Subject Headings. Statistics are given on occurrences of variable length fields and the length and maximum length of such fields in subject heading records. The usefulness of these statistics for system design is discussed. (five references) (CLB)

Reports on a study that examined spelling errors of keywords in a university library online catalog. Data are presented on distribution of errors by machine-readable catalog (MARC) field location, part of speech, origin of the bibliographic record, and error type. Commonly misspelled word roots and specific mistakes are listed. (12 references)…

Discusses a study conducted at Ohio State University Libraries to develop and test a model that accurately estimates number of terminals required in an online public access catalog system. Data collection, research methodology, standard statistical distributions, and queuing models are noted. Four references are cited. (EJS)