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Minicomputers provide an alternative means to access on‐line bibliographic retrieval systems. As the use of on‐line retrieval continues to grow and to spread into the nontechnical community, users and potential users will find it imperative to establish new methods to maximize the benefits of available on‐line systems. The paper explores the effects minicomputers can have on the on‐line retrieval environment. The experience at Editec indicates that minicomputers used in on‐line retrieval offer substantial benefits not possible using computer terminals, the major benefit being the increased acceptance of the on‐line search product by the end user community. Variable costs are held down to acceptable limits, the major consideration for those interested in their use being their high capital cost. The primary difference in using minicomputers rather than computer terminals is the ability to work at higher speeds. This enables many changes to be made which can affect the on‐line retrieval product. The decision to use minicomputers for on‐line retrieval entails lengthy analysis of current and projected use of on‐line retrieval within an organization, the availability of qualified staff, the costs of equipment and software development. It is hoped that some of the considerations in the paper may be helpful in analyzing these questions.

The possibility of having access to all the world's literature from a single computer terminal stimulated the imagination of the research workers in the late' sixties. It was this goal and the fascination of the co‐operation between man and machine, that inspired the major changes that have taken place in Information Retrieval over the past ten years.

A distinction is made between information retrieval and knowledge transfer, in terms of which the latter activity assumes a much greater degree of conceptual organization. It is argued that the current generation of on‐line information‐retrieval systems must evolve into so‐called ‘second generation’ systems that will support the more demanding requirements for knowledge instead of information. It appears that the man/machine interactive inquiry systems characteristic of today's on‐line activities can form a good basis for knowledge transfer, and an approach is described in which the LEADERMART information system is used as the platform for a knowledge‐transfer system. A model is described for the on‐line management and transfer of problem‐solving knowledge. Several ways in which information flow can be converted to knowledge‐transfer activities are explored, although there appears to be no unique paradigm for this conversion. Instead, knowledge transfer is explicated in terms of enhancements to on‐line retrieval manipulations, featuring an ever increasing emphasis on such direct forms of information transfer as numerical data retrieval and the retrieval of answer‐indicating passages. A new question‐analyzing procedure, QUANSY, is described which functions with another new technique for information regeneration to provide a start toward genuine knowledge transfer.

On‐line update combines a bibliography of recent on‐line articles with a search example from a data base producer or an on‐line system vendor.

VINE is a Very Informal Newsletter produced three times a year by the Information Officer for Library Automation and financed by the British Library Research & Development Department. It is issued free of charge on request to interested librarians, systems staff and library college lecturers. VINE'S objective is to provice an up‐to‐date picture of work being done in U.K. library automation which has not been reported elsewhere.

The activities that are at present furthering the visibility of numeric data bases and systems are discussed. A tentative estimate of the numbers of existing numeric data bases and systems in various categories of accessibility (on‐line, batch, and remotely accessible) and availability (public, restricted, and in‐house) is made. Numeric data bases and systems are becoming offered by information retrieval services through many of the channels that made bibliographic and textual information systems successful. These include remote accessibility and marketing by large data base vendors. The user community for numeric data bases is generally more restricted, with the possible exception of business and financial numeric data bases. User training needs are generally greater as well. Numeric data bases may nevertheless reach large user audiences with the advent of distributed processing and, ultimately, data base maps which can automatically locate and link together data bases in many locations.

The paper describes the prototype Associative Interactive Dictionary. (AID) system for search strategy formulation on a large operational free text on‐line bibliographic retrieval system. The primary design objective of the Associative Interactive Dictionary is the automatic generation and display of related terms, synonyms, broader and narrower terms and other semantic associations for given search concepts. The associative analysis procedures rely on statistical frequency distribution information about term occurrences in a set of document texts retrieved in response to a Boolean search query and the occurrence frequencies of the same terms in the entire data base. Over the past two decades, a number of small experimental retrieval systems have utilized term associations for automatic or semiautomatic document classification, indexing, thesaurus building or as a search aid. These experimental systems primarily employ term‐term and term‐document matrices for the computation of similarity measures between and among terms and documents. The matrix technique can not be implemented efficiently and cost effectively on large operational retrieval systems owing to problems of scale limitations. The major on‐line bibliographic search systems, such as ELHILL, ORBIT, DIALOG, RECON, BRS and others, do not provide any search aids other than the inherent browsing capability, term truncation and/or sequential string searching. In some files, manually constructed on‐line thesauri offer partial assistance to the user. The prototype AID system overcomes the problems of scale by utilizing a computationally efficient similarity measure and a highly compressed in‐core hash table of terms and term frequencies. The hash table can accommodate tens of thousands of free text search terms. Both an on‐line version and a batch version of the Associative Interactive Dictionary system are currently operational on TOXLINE, a large file of over 400,000 journal citations with abstracts on toxicology and the environment. TOXLINE is one of several on‐line data bases on the National Library of Medicine's ELHILL retrieval system. The overal design of the AID system is general in nature, and therefore it can be implemented on other large operational retrieval systems.

The coverage of the literature on on‐line retrieval systems by eight major machine‐readable data bases was determined. A search profile executed on these data bases produced 397 unique references. Ranking the data bases by journal coverage, relevance percentage, and the number of relevant items retrieved only from that data base showed that at least six data bases needed to be searched to obtain a comprehensive bibliography. These six data bases, in order of productivity, are INSPEC, CA Condensates, Social Sciences Citation Index, ERIC, MEDLINE, and BIOSIS. The need for an on‐line data base in library and information science is discussed.

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.

The results of the DIALIB project are described. This three‐year experiment of on‐line bibliographic search in the public library had as major participants four public libraries in the San Francisco Bay area. Five other public libraries in other parts of the USA participated to a lesser extent. Evaluation results were obtained concerning the users of the system and their characteristics, the use of the data bases, and librarian reactions to the system. In addition, interesting data were gathered concerning the time and cost of on‐line search, both in a free and fee‐for‐service environment.