The logic of different types of weighting are discussed, and experiments testing weighting schemes of these types are described. The results show that one type of weighting leads to material performance improvements in quite different collection environments. (22 references) (Author)

To index at the Defense Documentation Center (DDC), an automated system must choose single words or phrases rapidly and economically. Automation of DDC's indexing has been machine-aided from its inception. A machine-aided indexing system is described that indexes one million words of text per hour of CPU time. (22 references) (Author/SJ)

The technique described enables an on line computer based information retrieval system to aid indexers by selecting possible indexing terms to be assigned to a new document entering the system. The economic aspect of implementing the technique in a working information retrieval system is considered. (16 references) (Author/MM)

A proposal for a computer-aided method of building up an indexing language is made. The method involves linking terms relevant to any special retrieval system into the UDC, via a video terminal, producing a hybrid thesaurus-classification. (5 references)

Reports on a series of programs that have been developed to process data bases, consisting of textual items, and to index and arrange (classify) the data items in accordance with an automatically generated classification system. (Author)

Goffman's indirect method and a MeSH tree structure were used to classify a set of 109 medical documents. (PF)

The automated system used to create the "Weekly Subject Index" to "Current Contents Life Sciences" was recently redesigned to allow the creation of complex bound terms through the use of several

The concept of tri-citation is introduced, as a logical extension of co-citation, and a geometrical model (the circle) is devised to account for these and all other forms of multiple citation. (Author)

The results of a survey of computer techniques used in producing printed subject indexes are summarized in this paper. The survey was primarily concerned with collecting details of operational and available index generation software and particular emphasis was given to United Kingdom systems. (14 references) (Author)

The technique for machine-aided indexing developed at the Defense Documentation Center (DDC) is illustrated on a randomly chosen abstract. Additional text is provided in coded form so that the reader can more fully explore this technique. (2 references) (Author)

A system of automatic indexing based on Baye's theorem is described briefly. (18 references) (Author)

The author describes a method of automatic indexing using the assignment of priority to verbs which may also be viewed as a simulation of how a person classifies documents. (15 references) (Author/SJ)

Heuristic methods for the construction of term classes are presented and experimental results are obtained to illustrate the usefulness of the method. (Author/PF)

An automatic classification technique has been developed, based on the character structure of words. (Author)

An automatic classification technique using patterns formed by citations in document bibliographies was found to give 62 percent precision and 45 percent recall in a sample file of physics documents. (PF)