Test results are included which illustrate the effectiveness of the theory.

A textbook for a course in either an academic or a professional education program for librarians. Reviews the principles, practice, consistency, and quality of indexing; the types and functions of abstracts; natural language in informating retrieval; and the future of indexing and abstracting services. Annotation copyrighted by Book News, Inc., Portland, OR

To improve the indexing vocabulary, it becomes necessary to group low frequency terms into classes, and to break up high frequency terms by forming phrases.

A conceptual view of citation indexing; A historical view of citation indexing; The design and production of a citation index; The application of citation indexing to the patent literature; The citation index as a search tool; A science management tool; Citation analysis as a method of historical research into science; Mapping the structure of science; Citation analysis of sientific journals; Perspective on citation analysis of scientists.