This collection of library documents which provide instructions for users of online public access catalogs in member libraries of the Association of Research Libraries (ARL) contains: (1) a set of enhanced instructions for library users of Geac, a commercial online circulation system at the University of Arizona; (2) sets of materials of individual library automated systems, including the Library Control System (LCS) at Ohio State University, the Library User Information Service (LUIS) at Northwestern University, and ORION at the University of California/Los Angeles; (3) an example of instructional materials for public access to OCLC at the University of Texas/Austin; and (4) a set of instructions for public access to MELVYL, the online union catalog at the University of California/Berkeley. A concise summary of issues and trends covers the role of library staff in user instruction, underlying instructional philosophies, the format and cost of user instructions, and the relationship between online catalog instruction and bibliographic instruction programs. A 19-item bibliography on online catalogs and an evaluation sheet for this ARL Systems and Procedures Exchange Center (SPEC) kit are also provided. (ESR)