ISR11 An Experimental Investigation of Automatic Hierarchy Generation chapter G. Blomgren A. Goodman L. Kelly Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. VTII-ll T4 thesaurus T5 use Consider the query "THE USE OF A LIBRARY?t1. The non-trivial words are underlined. This query may be represented by a binary vector of concepts: 1110 lo lou If hierarchy mm[OCRerr]ber N = 5 is chosen: Specialize the query (add sons): LLwmjiooii Then expand the specialized query (add brothers): 1111111111 If hierarchy nuniber N = 4 is chosen: Ceneralize the original query (add parents): If hierarchy nun[OCRerr]er N = 9 is chosen: Specialize the original query (add sons): I i I 0 I 0 0 1 (No change)