A cost analysis of 411 on-line bibliographic search requests was conducted. The average cost was $28.41 exclusive of telephone line charges. (Author)

Examines usage patterns of ELHILL retrieval program of National Library of Medicine's MEDLARS system. Based on sample of 6,759 searches, the study analyzes frequency of various commands, classifies messages issued by system, and investigates searcher error rates. Suggestions for redesigning program and query language are noted. Seven references…

A cost analysis was made of on-line bibliographic searching in four public libraries in the San Francisco Bay Area using the Lockheed DIALOG system. The study involved monitoring the time that 35 individuals in the libraries spent processing some 411 search requests. The study identified a set of seven tasks that are performed for each request and…

Describes computer program which converts text of user input and system responses from online search system into fixed format records describing interaction. Query language syntax, format of output record produced by parser, problems in constructing parser, its performance characteristics, and recommendations for improving process of logging…

Explores response time variations in National Library of Medicine's ELHILL bibliographic search system and analyzes statistical significance of response time in terms of its variations by day of week, hour of day, particular bibliographic file being searched, command issued by user, number of users logged onto system. Ten references are cited.…