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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.

The purpose of this article is to present an overview of the history and development of transaction log analysis (TLA) in library and information science research. Organizing a literature review of the first twenty‐five years of TLA poses some challenges and requires some decisions. The primary organizing principle could be a strict chronology of the published research, the research questions addressed, the automated information retrieval (IR) systems that generated the data, the results gained, or even the researchers themselves. The group of active transaction log analyzers remains fairly small in number, and researchers who use transaction logs tend to use this method more than once, so tracing the development and refinement of individuals' uses of the methodology could provide insight into the progress of the method as a whole. For example, if we examine how researchers like W. David Penniman, John Tolle, Christine Borgman, Ray Larson, and Micheline Hancock‐Beaulieu have modified their own understandings and applications of the method over time, we may get an accurate sense of the development of all applications.

Some research has indicated that interacting with a computer through a natural language is not easier, more effective, or even preferred by new users of a system, when compared with menu and command interfaces. However, command‐driven searches would be facilitated, as users move from system to system, if there existed a common command language. Proposed standards for a “Common Command Language for Online, Interactive Information Retrieval” have been developed by NISO Committee G, and are now being reviewed for adoption.

Part I (in the previous issue of TEL) discussed how the changing library network environment and the trend towards decentralization and local, integrated systems was having an adverse affect on the growth of the bibliographic utilities. In this article, the reasons why the bibliographic utilities no longer dominate the North American library automation scene in quite the same way as before are summarized and their responses to the changing conditions and challenges brought about by microcomputers, integrated library systems and increased knowledge that libraries have about computers are discussed. Their responses can be viewed as a four part thrust: a move to distributed processing systems, participation in the Linked Systems Project; the introduction of new and improved services; and international ventures.

This article describes the emergence of the bibliographic utilities and the services they were able to offer to libraries in the face of the high costs and risks of computerization. In 1980 the utilities had dreams of one vast national bibliographic network and a network‐based total library system providing not only cataloging and location facilities but also acquisition, circulation, serials control and interlibrary loan facilities, too. The reasons why these dreams never materialised are noted together with factors why, although they are still major participants in the library automation and networking environment today, the four main bibliographic utilities in North America are declining in so far as use of their traditional services is concerned. The factors discussed include the trends towards decentralized operation with turnkey integrated library systems, the trend towards local resource sharing and the rapidly growing sophistication of librarians with computers. In Part 2, (to appear in the next issue of The Electronic Library) the ways in which the bibliographic utilities are fighting back to try and overcome these adverse trends will be discussed.

The ability to conduct unobtrusive observation of user searching is a potential strength of the method of information retrieval system analysis known as transaction log analysis (TLA). Transaction logs supply unequivocal information about what a user typed while searching. All other methods rely on self‐reporting, which, as Nielsen points out, is not always corroborated by the logs. Regardless of where in an institution information retrieval (IR) system evaluation takes place, TLA is a method that enables library staff at all levels to examine a variety of system and user‐related activities that are recorded on the log. Dominick suggested that TLA can enable the examination of three broad categories of activity: 1) system performance and resource utilization, 2) information retrieval performance, and 3) user interaction with the IR system. This article has been divided into several sections corresponding to functional areas in a library to suggest useful applications of TLA.

INTRODUCTION Computers and new information technologies have beyond question brought tremendous advancement in information storage and retrieval. In recent years, the traditional card catalog has given way first to the COM (computer output on microform) catalog, then to the online catalog. Now, many libraries are shifting to the new capability in order to provide better and faster services to their patrons.