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Jarvelin, Kalervo – Journal of Information Science, 1988
Discusses the problems associated with using connect time as the basis of user fees for searching numeric online databases, and proposes a methodology for user charge estimation based on query formulation and results. (87 references) (CLB)
Descriptors: Cost Estimates, Information Utilization, Literature Reviews, Models

Jarvelin, Kalervo – Journal of Information Science, 1988
Provides an overview of the development and use of numeric databases, and of the evolution of user charging methods for all online information retrieval systems. The need to provide database users with advance estimates of charges is discussed, and a methodology for charge estimation is presented. (87 references) (CLB)
Descriptors: Cost Estimates, Literature Reviews, Models, Numeric Databases