Theory, testing, and mechanization of the ABC retrieval system

Berthold Altmann and Walter A. Riessler

American Documentation, 1969, vol. 20, issue 1, 6-15

Abstract: A test collection of documents on solid state physics was indexed by creating highly controlled ABC descriptors which were categorized and weighted. Overlapping categories were used deliberately. Subject experts judged the relatedness of each paper to each category. Test queries were answered by vector‐like calculations of query‐document correlations. A new quantitative attribute, Deficiency, was devised and used for evaluating and comparing the retrieval results of different indexing systems. An improved matrix worksheet was designed for indexers. The progressive automation of most of the operational steps in using the ABC method is emphasized.

Date: 1969
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