Six uses of classification in online retrieval systems are envisioned--to improve recall and precision; to conceptualize meaning of vague search terms; to provide structure for browsing; to provide framework for retrieval of nonbibliographic information; to collocate citations; and to achieve compatibility of retrieval languages. Seven sources are…

Discusses theory of mental models--i.e., representations of relationships within a system which enable the user to produce mental simulations of the system's actions and develop ways of dealing with it--and its implications for user training, interface design, and overall systems design. (EJS)

Presents information retrieval design approach in which queries of computer-based system consist of sets of terms, either unweighted or weighted with subjective term precision estimates, and retrieval outputs ranked by probability of usefulness estimated by "maximum entropy principle." Boolean and weighted request systems are discussed.…

The low rate of relevant titles (fewer than 50 percent) retrieved by online searching of keywords in titles in study conducted at the Mechanized Information Center, Ohio State University, is attributed to three sources: titles themselves, user ignorance of subject vocabulary, and general language problems. Eight references are cited. (EJS)

Summarizes automation of a specialized library at Apple Computer, Inc., describing software packages chosen for the following functions: word processing/text editing; cataloging and circulation; reference; and in-house databases. Examples of each function and additional sources of information on software and equipment mentioned in the article are…

Explores methods and costs of the retrospective conversion process, i.e., converting card catalog records into machine readable form to create an automated catalog. Data conversion standards, methods, search strategy, databases, verification and editing, costs, and products of conversion are noted. Thirty-two references are cited. (EJS)

Discusses applications of a microcomputer in the Mountain View Elementary School Library in Colorado, noting costs and effectiveness involved in the development and use of a computerized card catalog and librarian aid with tasks such as filing, typing, ordering, and inventory. A bibliography is provided. (EJS)

A study of periodicals usage conducted at I.D. Weeks Library, University of South Dakota, used computerized databases to isolate journals important to individual departments and establish criteria for periodical subscription budget cuts. Three search methods used and costs incurred are outlined. Four references and search examples are provided.…

Reviews the benefits and disadvantages of online searching in the context of cooperative reference network services. The cost effectiveness of centralization of online information retrieval services, problems associated with doing searches at the network level, and subsidizing search services are discussed. (Author/JL)

Describes the challenge to libraries involved in the development of online catalogs, discusses the revolutionary importance to librarianship of the online catalog, outlines the role of effective planning in implementing online catalogs, and projects some changes that will occur in libraries because of them. (JL)

Possible applications of the micro- or personal computer useful to the physical educator are suggested under four major categories: (1) data processing; (2) data storage; (3) control of peripheral devices; and (4) computer-assisted instruction. (JN)

Considers the use of nonbibliographic databases, also known as source files, as an information service supplied to library users and notes commercially produced databases, brokerage firms offering a variety of small databases, community resource files, differences between use of bibliographic and non-bibliographic databases including fees, and…

Discusses the need to educate the library's professional reference staff in online searching so that subsequent training on the job will be more effective. (FM)

Describes a study conducted at Purdue University Library to determine not only the costs of providing online information services to users, but the value of time saved by the end user in having a computer search run and user satisfaction with the results. Six references are listed. (RBF)

Presents overview of NEXIS, an online computer system providing access to the full text of magazines, newspapers, and wire services relevant to public affairs, social science, business, and general news. Describes free text search techniques, system features, and costs. A special NEXIS terminal has been developed by Mead Data Center. (RBF)