Examines two databases--MEDLINE and ABI/INFORM--as currently implemented on laserdisk, commercial systems, and local time-sharing in the University of Pennsylvania libraries. The direct costs to the library of installing and operating the three formats are analyzed, and costs and benefits to users are discussed, including comparisons of the…

This continuation of an earlier article discusses online vendors' responses to users' concerns as well as the future of online services. Maxwell Online, Dialog, Mead Data, Data-Star, and Dow Jones News/Retrieval address user needs, search strategies, databases, document retrieval and display, user interface, and cost and economic issues. (LRW)

The advantages and disadvantages of the compact disk version of the DISCLOSURE database are compared to the print version and other online formats. Currentness of information, searching methods, users' perceptions taken from a student survey, price, availability, response time, and browsabiity are considered. Sample menus and screen displays are…