ISR11 Design Criteria for Automatic Information Systems chapter M. E. Lesk G. Salton Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. Harris 3 - Title Only 0 Harris Three x PRECISION PRECISION 1.0 1.0- x 0 0.8 A 0.8- 0.6- 0.6- 0 0.4- K 0 0.4- \0 o.a 0.2- I I a I a RECALL I a aRECALL 0 0.2 0.4 0.6 0.8 1.0 0 0.2 0.4 0.6 0.8 1.0 x Abstract Thesaurus x ½ Full TeKt Thesaurus a) Title versus Abstract b) Abstract versus Full Text Process (IRE-2) (ADI collection) Compurison Bused on Document Length Fig. 5