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See Toward the Principled Enganeering of Knowledge. Expert Systems: Where are we? And where do we go from here? Feigenbaum, Edward A, See Signal-to-symbol transformation: HASP/SIAP case study. Research in Progress Vol IV, No. 4, p. 58, Winter, 1983 THE AI MAGAZINE Spring 1984 83 K Minsky, Marvin Why People Think Computers Can't.