Book Reviews THINKING BETWEEN THE LINES Gary C. Borchardt The MIT Press Cambridge, Massachusetts 1994, xii+298, $35.00 Reviewed by: George Vouros Deptartment of Mathematics University of the Aegean Karlovasi Samos Greece Current Address: Inst. of Informatics and Telecommunications NCSR Demokritos Agia Paraskevi Attikis 15310 Greece "We are witnessing the dawn of a new age in which computers will play an increasingly important role in the dissemination of techmcal" knowledge: from experts to students, among,,1scientists and engineers and from manufacturers to consumers . In this general context, Borchardt poses the following research challenge: "...how computers may deal effectively with a particular form of technical knowledge--written causal descriptions of the sort commonly found in encyclopedias, reports and user manuals.". In this book, Borchardt describes how a computer program can comprehend written causal descriptions. To achieve this objective, the author proposes three key components: (1) the causal reconstruction task, (2) the transition space representation(3) the PATHFINDER program. The approach presented is mainly characterised by the use of a simplified language for written causal descriptions, by the ellipsis of background knowledge for comprehending descriptions, and finally, by the use of Graces maxims for describing causal knowledge and for determining whether the comprehender
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