Add to ORKGThis paper discusses online public access catalog (OPAC) models and milestones. The journey of the networked online catalog has clearly departed from its early, first-generation manifestation as a stand-alone, local "card catalog online" and continues at an alarming pace in its evolution to some fuzzily conceived expanded, transformed entity we may humbly refer to for now as the library catalog information system. What this future information management and retrieval system will be like is not entirely clear, which makes it the topic of much speculation and wishful thinking. Its parameters and features may be decided by, nay, even driven by, new, emergent technologies, or, hopefully, its form and function will be guided by the know...