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Expert Systems: Where Are We? And Where Do We Go From Here? This article has benefited from careful readings by and suggestions from Mike Brady, Bruce Buchanan, Ed Feigenbaum, Jo& Gon&lez, Pete Szolovits, and Pat Winston Editor's note: This article was the author's "Invited Lecture" at IJCAI 7 Where has the Accepted Wisdom succeeded? One important goal of this part of the journey will be to calibrate the current state of the art-Given what we know, what can we do and how quickly can we do it? Does building a system typically require several months or several years?