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ACM Transactions on Information Systems (TOIS), Volume 17 Issue 1, Jan. 1999

Predicate rewriting for translating Boolean queries in a heterogeneous information system
Chen-Chuan K. Chang, Héctor Garcia-Molina, Andreas Paepcke
Pages: 1-39
DOI: 10.1145/297117.297120
Searching over heterogeneous information sources is difficult in part because of the nonuniform query languages. Our approach is to allow users to compose Boolean queries in one rich front-end language. For each user query and target source, we...

Methods for information server selection
David Hawking, Paul Thistlewaite
Pages: 40-76
DOI: 10.1145/297117.297123
The problem of using a broker to select a subset of available information servers in order to achieve a good trade-off between document retrieval effectiveness and cost is addressed. Server selection methods which are capable of operating in the...

The equalizing impact of a group support system on status differentials
Bernard C. Y. Tan, Kwok-kee Wei, Richard T. Watson
Pages: 77-100
DOI: 10.1145/297117.297126
This study investigates the impact of the electronic communication capability of a group support system (GSS) on status differentials in small groups. A laboratory experiment was used to answer the research questions. Three support levels were...