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*Many* thanks to everyone (19 people) who responded to my question about resource authority files. I do want to clarify one point: here at the Unversity of Chicago we have been doing NACO work on OCLC for several years, and having this file would not change our adherence to established procedures or our use of the NACO macro features in any way; a couple of people seemed to think that we were planning to do all our work against the proposed resource file, so that our work would be out of date before it was input! We are happy with OCLC as our vehicle for NACO, with the exception of searching. Our interest is in making our searching as efficient as possible, so we can minimize the risk of duplicating authorities; also, our ILS, Horizon (4.2v3), processes authorities and the headings on bibliographic records in such a way that it is often necessary to consult the pristine LC authority file to understand changes that have been automatically applied, and we do not find any of the ways that are currently available to us to do this to be very efficient compared to a local resource file. As we are doing large-scale recon, the volume of incoming headings that need to be reviewed may be up to several hundred in a day, of which some portion would have to be checked in the LC authority file. I have to say that the responses, though much appreciated, reveal no surprising information. Many libraries are living with OCLC and supplementing with LOCIS or RLIN. Only one respondent specifically supported the need for keyword searching from OCLC. A couple of libraries reported using OCLC satisfactorily without a backup approach. One library uses LOCIS and RLIN. Two libraries use RLIN, OCLC or LOCIS, and a local resource file all together. If anyone wants more information, let me know. Thank you all very much for your input! Jane Jane Ciacci Head, Cataloging Department The University of Chicago Library 1100 East 57th St., Rm. 172 Chicago, IL 60637 tel: (773)702-8739 fax: (773)702-6623