A correlation between recall (the retrieval of all available relevant documents) and quantity of text which served as a source of index terms on input can reasonably be expected. Specifically, recall should decrease as the quantity of text serving as a source of index terms is restricted. On the other hand, the time for indexing and therefore the…

Discusses science and engineering students' reactions and attitudes toward the use of on-line bibliographic information retrieval and major search systems vs manual searching in a course dealing with information resources. Problems encountered and the relevance to student needs of the on-line component of the course are included. (Author/CWM)

Briefly reviews various methodologies for constructing enhanced document representations, discusses their general lack of usefulness, and describes a method of document indexing which uses title words taken from bibliographically related items. Evaluation of this process indicates that it is not sufficiently reliable to warrant incorporation into…

Provides an overview of methods for improving the effectiveness of Boolean retrieval systems, including document clustering, relevance feedback, weighted term searching, ranked output, and fuzzy set theory. The discussion of experimental studies with the SMART and SIRE systems focuses on the implementation and results of these methods. (69…

Results of field study measuring end-user perceptions of sources of information (computer-based, libraries, individuals) suggest that accessibility is multidimensional concept encompassing physical access to source, interface with source, ability to physically retrieve potentially relevant information; and perceptions of accessibility are…

Describes a system for identifying and retrieving relevant citations on a monthly basis which can be accomplished with any microcomputer and printer possessing capability of telecommunication and downloading. Procedures for comprehensive search, downloading, formatting of information for printing, printing file cards and abstracts, and…

Results of comparison of online and manual searching of same subject favor online searching, which found 87 percent of relevant titles versus 33 percent for manual search. A simple search strategy produced nearly as many citations as complex search, and over two-thirds of records came from two of 13 files searched. (EJS)

Examines usefulness of DIALOG as legal research tool through use of DIALOG's DIALINDEX database to identify those databases among almost 200 available that contain large numbers of records related to federal securities regulation. Eight databases selected for further study are detailed. Twenty-six footnotes, database statistics, and samples are…

Explores potential of mathematical theory of communication for information science and examines question of how to encode a message at time it is encountered for subsequent recall. Examples of problem, a prototype computer program and experiment, coding as embedding in associational nets, and nature of information are discussed. (Nine references.)…

Describes design and development of a thesaurus based on lexical-semantic relations, and compares results of experiments with queries enhanced using thesauri based on several different groups of relations against performance with original queries run on IRS information retrieval system developed at Illinois Institute of Technology. Twenty-one…

The mathematical model proposed describes a computerized bibliographic information system which includes a method--document learning--of improving the set of index terms assigned to a document representative. Inputs to the information system (index terms and query), relevance feedback, and assumptions concerning the model are discussed.…

Summarizes the results of a study accessing music coverage in 11 databases--ABI/INFORM, AMERICA--HISTORY AND LIFE, ERIC, HISTORICAL ABSTRACTS, INSPEC, MAGAZINE INDEX, MLA BIBLIOGRAPHY, NATIONAL NEWSPAPER INDEX, PUBLIC AFFAIRS INFORMATION SERVICE INTERNATIONAL, PSYCHINFO, and SOCIOLOGICAL ABSTRACTS. Selection of search terms and relevance of items…

Forty end-users with individual information problems from an academic environment were observed, interacting with six professional intermediaries searching on their behalf in large operational systems. Conceptual categories of users' reasons for assigning particular value ratings on the value of search results and relationships between these…

Explores current research on indexing and ranking as retrieval functions of search engines on the Web. Highlights include measuring search engine stability; evaluation of Web indexing and retrieval; Web crawlers; hyperlinks for indexing and ranking; ranking for metasearch; document structure; citation indexing; relevance; query evaluation;…

This essay extends observations made by the author to Dan Marmion, in his editorial, "The Bully Pulpit" ("Information Technology and Libraries," June 1999). The author makes the point that sometimes a user can find an answer to a reference question more efficiently and effectively in a print source, sometimes in an electronic source, and sometimes…