ISR11 Design Consideration for Time Shared Automatic Documentation Centers chapter M. E. Lesk Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. X-7 on an attached microfilm reader of the document itself. Further answers would be provided in similar forms. 6) The user now eval[OCRerr]ates his output. Depending on the form in which the documents were presented, this may require him to leave the console and scarch for a book or journal in the librar[OCRerr]r stacks. If this is necessary, the computer search should be designed with high precision in mind. If the user can obtain the document directly from an attached or nearby microfilm reader/printer, somewhat less emphasis need be placed on the precision of the methods used. 7) The user may be satisfied with the results of this search, in which case he leaves the console and studies the document(s) produced. He may be extremely dissatisfied, and as a result he may leave the console in disgust. This may be considered to be a failure of the sy[OCRerr]em, and the search strategy should be designed to avoid it. Probably, he will be partially satisfied, and will rephrase his request and try again. This partial satis- faction may arise from one of three causes: a) The computer has retrieved documents that are not relevant to the question as stated. b) The computer has retrieved documents that are relevant to the question as stated, but because of ambiguities or misphrasings, the retrieved documents are not relevant to what the user actually intended as his request. c) The computer has retrieved documents that are relevant to the question as intended and stated, but after consideration of these documents the user h[OCRerr]s decided that he asked for the wrong topic. The request may be rephrased by the user, or by the computer, using feedback data from the user. In case a), the problem is basically a flaw in the c[OCRerr]nputer system, which may be compensated by artificially constructing