Describes the development of a thesaurus for indexing the databases of Engineering Information, Inc., that improved the former precoordinate indexing vocabulary with postcoordinate descriptors and an appropriate set of thesaurus relationships. Problems of incompatibility with old indexing are addressed, and the use of an outside consultant versus…

Describes the use of machine aided indexing as part of NASA's information systems. The discussion covers reasons for incorporating machine aided indexing, the lexical dictionary used, subject switching, natural language processing, benefits to the system, and possible future developments. (CLB)

Discussion of computer-aided indexing activity focuses on examples from projects at the National Aeronautics and Space Administration (NASA). Standardization and quality in providing subject access to databases are considered; and computer-aided lexicography, including thesaurus construction, access vocabulary, definitions preparation,…

Describes study conducted with British undergraduate library science students that compared natural language indexing and searching with controlled language searching on a computerized database. The use of the ERIC Thesaurus and Sears List of Subject Headings is explained, recall and precision measures are reported, and further research is…