1. OCLC Online Computer Library Center Building Union Catalogs Using OCLC WorldCat Matt Hartfield, Project Manager matt_hartfield@oclc.org

2. Agenda Models for building a union catalog Why we chose a centralized model Benefits of the centralized model Technological challenges Results of the OCLC group services pilot project (Mark Flynn, State Library of Florida)

3. Local OPACs Simple distributed virtual union catalog model EC D A B User Virtual catalog

4. Distributed union catalog model – scalability User Virtual catalog

5. Cataloging tools Library A Library B Library C Centralized union catalog with OCLC WorldCat Separate, Physical Union Catalog with WorldCat A and B B and C Separate Group Catalogs

6. Cataloging tools Library A Library B Library C Centralized union catalog with OCLC WorldCat Centralized Union Catalog with OCLC WorldCat

7. Libraries Worldwide: 1000 Adventures of Huckleberry Finn Mark Twain New York : Random House 1996 Bibliographic record with associated holdings record LIBRARY A LIBRARY B LIBRARY C

8. 50 million records Interoperability with remote databases Virtual catalogs Aggregators, Resolution servers Web, Z39.50, NCIP Local OPACs E D C B A OpenURL, Z39.50 Web, Z39.50

9. Library A Library B Library C Library A Library C Consortium X Using WorldCat as basis for consortial union catalog Group Catalog X

10. Libraries in Group Catalog X: 2 Adventures of Huckleberry Finn Mark Twain New York : Random House 1996 View of WorldCat limited to holdings of consortia LIBRARY A LIBRARY C

11. 50 million records Consortium X Group catalog: 10 million records Consortium Y Group catalog: 1 million records Consortium Z Group catalog: 50,000 records Multiple WorldCat-based group catalogs

12. Group Catalog X Group Catalog Y Group Catalog Z Group catalogs function as virtual databases Virtual catalogs Aggregators, Resolution servers Web, Z39.50, NCIP Local OPACs E D C B A OpenURL, Z39.50 Web, Z39.50

13. Benefits of Centralized Model More accurate search results Multiple indexes supported Indexing uniform across scopes Scalability Search results returned quickly for large groups Efficiencies of scale Build it once, less individual configuration necessary

14. Benefits of Centralized Model Fast implementation Builds on what libraries already have in WorldCat Saves money Hosted service Less staff time and technical expertise required No switching costs Builds on what libraries already have in WorldCat

15. & Q uestions A nswers