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01706159 Garcia, Oscar N. Known concerns about fuzzy logic. IEEE Expert 9, No.4, 22-24 (1994). 1994 EN I.2.3 F.4.1 expert system design fuzzy logic fuzzy control modeling of uncertainty Zbl 1009.03518 Zbl 1009.03519 Zbl 1009.03520 Zbl 1009.03522 Zbl 1009.03525 Zbl 1009.03526 Zbl 1009.03527 Zbl 1009.03528 Zbl 1009.03529 Zbl 1009.03530 Zbl 1009.03531 Zbl 1009.03532 Zbl 1009.03517 Zbl 1009.03521 Zbl 1009.03524 Zbl 1009.03533 This paper is part of a series of position statements related to a paper of {\it C. Elkan} [IEEE Expert 9, No. 4, 3-8 (1994; Zbl 1009.03517)] which was intended to give a critical evaluation of the (un-) importance of fuzzy logic (in the wider sense) for AI and knowledge engineering. Most of these statements explain their authors' points of view or sketch some particular approaches toward fuzzy logic and their applications, particularly in fuzzy control and the modeling of uncertainty. The mathematical and methodological defects of Elkan's paper are most clearly explained in the statements given by {\it D. Dubois} and {\it H. Prade} [ibid. 9, 15-19 (1994; Zbl 1009.03521)] and by {\it G. J. Klir} and {\it B. Yuan} [ibid. 9, 25-26 (1994; Zbl 1009.03524)]. The series of papers is closed with a reply by Elkan [ibid. 9, 47-49 (1994; Zbl 1009.03533)]. Siegfried Johannes Gottwald (Leipzig)