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Most second‐generation online catalogs give libraries some capability to customize help messages, screen displays, and system prompts. Microcomputer applications designed or mounted locally may offer even more flexibility. Commercially available information systems offer the user some type of assistance, even when not totally profitable. The librarian has become an active, if not always willing, participant in the design of his or her system's user interface. Knowledge of both patrons and collections can have direct bearing on the structure and effectiveness of the library's automated system, its interface, and online help features.

Because the Common Command Language was designed primarily with the end‐user in mind, many of the now commonly accepted principles of user‐interface design were applied in its development. A terse but English‐like syntax and vocabulary were chosen, with a verb‐object structure. This was chosen in preference to a natural language because it can express an instruction briefly, clearly, and precisely, in contrast to the often verbose ambiguity of English. The benefits of the Common Command Language are discussed, as are remaining problems that will be encountered in cross‐system searching.

Digital library research has attracted much attention in the most developed, and in a number of developing, countries. While many digital library research projects are funded by government agencies and national and international bodies, some are run by specific academic and research institutions and libraries, either individually or collaboratively. While some digital library projects, such as the ELINOR project in the UK, the first two phases of the eLib (Electronic Libraries) Programme in the UK, and the first phase of DLI (Digital Library Initiative) in the US, are now over, a number of other projects are currently under way in different parts of the world. Beginning with the definitions and characteristics of digital libraries, as proposed by various researchers, this paper provides brief accounts of some major digital library projects that are currently in progress, or are just completed, in different parts of the world. There follows a review of digital library research under sixteen major headings. Literature for this review has been identified through a search on LISA CD‐ROM database, and a Dialog search on library and information science databases, and the resulting output has been supplemented by a scan of the various issues of D‐Lib Magazine and Ariadne, and the websites of various organisations and institutions engaged in digital library research. The review indicates that we have learned a lot through digital library research within a short span of time. However, a number of issues are yet to be resolved. The paper ends with an indication of the research issues that need to be addressed and resolved in the near future in order to bring the digital library from the researcher‘s laboratory to the real life environment.

Creating a Bibliographic Workstation for Scientists and Engineers. A library workstation, in its simplest form, is a computer that provides access to bibliographic information transparently in spite of its myriad forms. The conceptual kernel of this workstation is, more or less, a machine designed by, and for the use of, librarians and their staff, obstensibly to care and feed a bibliographic database. Suppose we expand our ideas on this particular kind of computer in order to invent a special species that will meet the demands of a critical clientele, for specialized literature.

Over the past eight years, the MELVYL catalog has become one of the largest public access catalogs in the world, and now plays a central role in providing access to the library resources of the University of California. Currently, under heavy load, the MELVYL catalog supports many hundreds of simultaneous terminal connections, servicing over a quarter of a million queries a week and displaying more than two million records a week to its user community. This article discusses the history of the network that has supported the MELVYL catalog from the early days of its prototype to the present. It also describes both the current technical and policy issues that must be addressed as the network moves into the 1990s, and the roles that the network is coming to play in integrating local automation, the union catalog, access to resource databases, and other initiatives. Sidebars discuss the TCP/IP protocol suite, internet protocol gateways, and Telenet and related inter‐operability problems.

Online catalogs from 67 libraries using NOTIS software were searched using Internet connections to determine the positional operators selected as the default keyword operator on each catalog. The diverse results indicated that there is no standard default positional operator.

The following is an annotated list of materials dealing with orientation to library facilities and services, instruction in the use of information resources, and research and computer skills related to retrieving, using, and evaluating information. This review, the sixteenth to be published in Reference Services Review, includes items in English published in 1989. A few are not annotated because the compiler could not obtain copies of them for this review.

The Albert R. Mann Library at Cornell University has created a working electronic library and has made significant changes in services and staff responsibilities to address users' evolving needs. This article presents an overview of these changes, after discussing the development of electronic libraries at Mann and elsewhere. The increased usage that Mann's collections have received as the electronic library has been developed is also described.

In public-private partnership (PPP) contracts of water utilities, of particular concern is lack of market competition. This paper focuses on the size of contracts. If governments design a large-scale transaction, economies of scale in service operation can be expected, but competition in auctions may be compromised. For small contracts many firms will apply, but at the cost of scale diseconomies in operation. The estimated cost function of PPP water utilities indicates that economies of scale exist but diminish quickly as production increases. There is no rationale for more than 300 million cubic meters of water service concessions under a single package, taking a risk of little competition. Conversely, less than 50 million cubic meters of concessions are too small; the bundling approach is required.