Discusses how imprecision and uncertainty are dealt with in the UFO (Uncertainty and Fuzziness in an Object-oriented) database model. Such information is expressed by means of possibility distributions, and modeled by means of the proposed concept of "role objects." The role objects model uncertain, tentative information about objects,…

Describes a study that examined the effectiveness of implied boolean searches using personal author surnames plus first and/or last title words to retrieve an entry from a simulated online public access catalog (OPAC). Implications for the design of OPACs are discussed, and further research is suggested. (LRW)

Investigates how to improve the performance of an Arabic Information Retrieval System (Arabic-IRS) by imposing the retrieval method, Mixed Stemming, over individual words of a query depending on the importance of the word, the stem or the root of the query terms in the database. This method computes term importance using a Term Frequency and…

Information customization is a client-side activity designed to pick up where information filtering leaves off. This article describes a vision of information customization and chronicles the development of a proof-of-concept prototype, Cyberbrowser, for customizing information on the Web. (Author/AEF)

Uses a simple model of an information retrieval (IR) technology to examine performance measures for IR systems. Shows that, if a user is employing a system optimally, then reasonable performance measures will tend to be relatively robust, or insensitive, to small variations in assumptions about the user's behavior. (AEF)

Coordinated index concepts are compound-index concepts that express a relationship between concepts that function as simple subject descriptors. The Condorcet Query Engine, a prototype query engine that can be run over the World Wide Web, demonstrates the feasibility of a query engine that can handle both simple and coordinated index concepts,…

Examines whether search engine design shows a pattern of interdisciplinarity focusing on two disciplines: computer science and library/information science. A citation analysis measured levels of interdisciplinary research and publishing in search engine design and development. Results show a higher level of interdisciplinarity among library and…

Describes two experiments that investigated the influence of textual factors on the perception of bibliographic records. Topics include index descriptors; term overlap; extent of semantic distance; direction of semantic distance; generic trees of descriptors; relevance perception; and implications for the design of information retrieval…

Describes the development of a computer-supported cooperative problem-solving environment designed to help librarians and remote access users work together in performing an online search. Results of a study of graduate students indicate that groups using the computer demonstrated more effective skills than those performing the same tasks face to…

Presents a set of methods and results for characterizing decision making while searching online databases. The discussion compares these results to studies of decision making in other contexts, and examines the role of user uncertainty and expectations, as well as implications of the findings for database design and user training. (37 references)…

Describes the design and development of a prototype expert system called ONLINE-EXPERT that helps users select online databases and vendors that meet users' needs. Search strategies are discussed; knowledge acquisition and knowledge bases are described; and the Analytic Hierarchy Process (AHP), a decision analysis technique that ranks databases,…

Reports on design and rationale of Online Access to Knowledge, a computer intermediary developed by Online Access to Knowledge Project to enable users with little or no training or experience in bibliographic searching to conduct their own searches. Topics covered include software design, tutorials and assistance programs, and conclusions based on…

Describes a study at Louisiana State University that described the criteria mentioned by users evaluating the information within documents as it related to the user's information need situation. Implications for understanding the concept of relevance, for the design and evaluation of information retrieval systems, and for future research are…