This research project focuses on the implementation and testing of the Dewey Decimal Classification (DDC) system as an online searcher's tool for subject access, browsing, and display in an online catalog. The research project comprises 12 activities. The three interim reports in this document cover the first seven of these activities: (1) obtain documentation and selected portions of DDC from Inforonics and experiment with this DDC in a machine environment; (2) share the results of Activity 1 with library representatives, DDC editor, Forest Press, consultants, and Council on Library Resources (CLR) Project Monitor and obtain their recommendations for DDC fields and text for subject access, browsing, and display in an online public access catalog (OPAC); (3) evaluate recommendations of Activity 2 with DDC editor and other concerned parties to determine DDC fields and text for subject access, browsing, and display in an OPAC; (4) obtain participating libraries' bibliographic records in classification areas of interest; (5) index each library's bibliographic records in ways characteristic of online catalogs; (6) design, test, and implement software to provide subject access, browsing, and display of the DDC in the OPAC; and (7) design, pretest, and refine research design, experimental procedures, post-search interview instruments, and sample searches. Numerous appendices include a version of the Dewey Online Catalog for review, lists of reviewers, their comments, and questionnaires and worksheets. (THC)