Abstract
Haack (1979) has questioned the need for fuzzy logic on methodological and linguistic grounds. However, three possible roles for fuzzy logic should be distinguished; as a requisite apparatus—because the world poses fuzzy problems; as a prescriptive apparatus—the only proper calculus for the manipulation of fuzzy data; as a descriptive apparatus—some existing inference system demands description in fuzzy terms. Haack does not examine these distinctions. It is argued that recognition of various different roles for fuzzy logics strengthens the pragmatic case for their development but that their formal justification remains somewhat exposed to Haack's arguments. An attempt is made to reconcile pragmatic pressures and theoretical issues by introducing the idea that fuzzy operations should be carried out on subjective statements about the world, leaving standard logic as the proper basis for objective computations.
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