Search results

There is a huge amount of information and data stored in publicly available online databases that consist of large text files accessed by Boolean search techniques. It is widely held that less use is made of these databases than could or should be the case, and that one reason for this is that potential users find it difficult to identify which databases to search, to use the various command languages of the hosts and to construct the Boolean search statements required. This reasoning has stimulated a considerable amount of exploration and development work on the construction of search interfaces, to aid the inexperienced user to gain effective access to these databases. The aim of our paper is to review aspects of the design of such interfaces: to indicate the requirements that must be met if maximum aid is to be offered to the inexperienced searcher; to spell out the knowledge that must be incorporated in an interface if such aid is to be given; to describe some of the solutions that have been implemented in experimental and operational interfaces; and to discuss some of the problems encountered. The paper closes with an extensive bibliography of references relevant to online search aids, going well beyond the items explicitly mentioned in the text. An index to software appears after the bibliography at the end of the paper.

Among several “laws” that have been discussed in the literature of bibliometrics, the one best known is that commonly referred to as Bradford's Law of Scatteing. A substantial body of literature exists on how the law is best represented mathematically but, for our present purposes, it is enough to consider the phenomenon at a broader conceptual level. The law, as first described by Bradford, refers to the scatter of journal articles over journal titles. If a comprehensive search is performed over a particular time period and all, or virtually all, journal articles on the search topic are discovered, it is possible to rank the journal titles by number of articles on the topic they contribute. At the top of the list might appear a single title that contributed, say, 145 articles. At the bottom of the list might appear many journals that have only contributed a single article each to the subject. The ranked list can be divided into a number of “zones” (Bradford used three zones but four or more might be used) such that each zone contains approximately the same number of journal articles. This being so, the number of journals in each zone increases at an approximately geometric rate. This is illustrated by a simple example:

It is contended that knowledge management is directed towards finding out how and why information users think, what they know about what they know, the knowledge and attitudes they have and the decisions they make when they interact with others. At the heart lies the mutation of information into knowledge, a process best understood through seeing, knowing and information retrieval as features common to cognitive psychology and information management. The knowledge we have of knowledge, and changes to knowledge, can be monitored in negotiations like knowledge interviews for trainees. Such knowledge and belief systems can also be translated into managerial strategies, both qualitative, as when we emphasise value and benefit in the marketing approach to information, and quantitative, as when we devise ways of assessing probabilities with which desired outcomes will occur. Knowledge management is as much the management of meaning as management of entities and people, for in meaning lies the key to our understanding of what we decide to do as information managers. It is a multi‐disciplinary field offering a semantics and pragmatics for the evaluating and self‐evaluating manager.

The need for thesauri to help users in their search for information in online information systems has been discussed for several decades. Many wide‐ranging contributions have been made to solve this problem. Nevertheless, investigation is needed to design a thesaurus structure based on what is relevant for users and generators of information within a specific subject domain. This paper explores the possibility of creating a thesaurus from the cognitive viewpoint. This approach is based on a system (in this case represented by a thesaurus) that organises its representation of knowledge or its classification as closely as possible to the authors‘ and users’ images of the subject domain with the objective of increasing the interaction between users and texts, and thus the communication in a given information retrieval system. From this point of view, the thesaurus structure is considered as the essential foundation on which to base such an interactive thesaurus. Furthermore, this structure is conceived as representing the merging point for both the generators‘ and the users’ models of the subject domain and for their information needs. This paper is dedicated mainly to the generators‘ side involved in this process. It demonstrates how an author’s writings can be used to identify the generators‘ model and perception of the subject domain, and how these can later be inserted in the thesaurus structure. Discourse analysis is used as a main method to identify the categories and its relevance for building such a structure is discussed. It also outlines a general approach for the user side to set up different methods of getting the users’ information needs into the thesaurus structure.

As a result of the comprehensive evaluation of MEDLARS conducted in 1966–7, several recommendations were made to the National Library of Medicine as measures appropriate to the improvement of effectiveness and efficiency of the system. This brief paper summarizes these recommendations and discusses steps since taken by NLM to implement them.

Universities are social and economic instruments for investment in man and thereby for the development of human resources at the highest level. This is truer in the case of developing countries where science and technology have not yet extended their beneficial aspects to whole spheres of social life. While preserving culture and heritage, universities are the most powerful institutions for social change and innovation. At the same time, universities and colleges themselves are subject to changes and need to adapt to these.

Mountbatten offers a vivid description of the current‐awareness function using the analogy of a very wide conveyor‐belt, representing the information publishers, on which books, periodicals and reports appear at random: ‘The searcher is on a platform just above the belt and as the information material passes underneath he can pick up and read anything that he thinks might be of interest to him. You can imagine his frustration as he realises that for every item he takes time to examine, hundreds of others of possible interest to him have passed by’. Personality and environment will determine whether the individual can find an intelligent compromise between the extremes of neurosis induced by worrying about the material he is missing, or complacency with any system which produces one or two interesting items.

The World Wide Web's search engines are the main tools for indexing and retrieval of Internet resources today. Comparison and evaluation of their performance is of great importance for system developers and information professionals, as well as end‐users, for the improvement and development of better tools. The paper describes categories and special features of Web‐based databases and compares them with traditional databases. It then presents a review of the literature on the testing and evaluation of Web‐based search engines. Different methodologies and measures used in previous studies are described and their findings are summarised. The paper presents some evaluative comments on previous studies and suggests areas for future investigation, particularly evaluation of Web‐based search engines from the end‐user's perspective.