Discussion of basic telecommunications concepts includes data terminal equipment, carrier equipment and data communications equipment. Guidelines offered for librarians planning the implementation of a telecommunications network address reliability and costs of equipment, requirements of the system, and ease of use of the system. (CLB)

Proposes a rationale to be used in comparing and evaluating alternative library computer catalogs, based on varieties of bibliographic data processed, kinds of indexes constructed, and desired search strategies. A glossary of terms related to computerized catalogs is appended. (Author/CLB)